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categories: ["society"]categories: ["society"]tags: ["bioethics", "philosophy", "precaution", "human dignity", "politics"]tags: ["bioethics", "philosophy", "precaution", "human dignity", "politics"]summary: "The position that biotechnological modification of human beings should face a strong presumption against it, grounded in dignity, precaution, or the value of the given."summary: "The position that biotechnological modification of human beings should face a strong presumption against it, grounded in dignity, precaution, or the value of the given."updated: "2026-07-27"updated: "2026-10-29"issues: ["The stem-cell-clinic harms and the 2019 plasma warning are stated without sources."]------ ```infobox```infoboxlines 18–76 → 17–753 unchanged lines not shown
{ "label": "Core claim", "value": "Presumption against modification" }, { "label": "Core claim", "value": "Presumption against modification" }, { "label": "Term originated", "value": "Early 2000s" }, { "label": "Term originated", "value": "Early 2000s" }, { "label": "Principal authors", "value": "Kass, Fukuyama, Habermas, McKibben" }, { "label": "Principal authors", "value": "Kass, Fukuyama, Habermas, McKibben" }, { "label": "Institutional peak", "value": "US President's Council, 2001–2009" }, { "label": "Institutional peak", "value": "US President's Council, 2001-2009" }, { "label": "Political alignment", "value": "Right and left strands" }, { "label": "Political alignment", "value": "Right and left strands" }, { "label": "Chief opponent", "value": "Transhumanism", "link": "/wiki/transhumanism" } { "label": "Chief opponent", "value": "Transhumanism", "link": "/wiki/transhumanism" } ] ]}}`````` **Bioconservatism** is the view that deliberate biotechnological alteration of human nature should meet a strong presumption against it, and that some such alterations should be refused outright rather than regulated. The label was coined in transhumanist circles in the early 2000s and is used mostly by opponents of the position; few of the writers it describes adopt it. What unites them is not a shared politics but a shared structure of argument: that the burden of justification rests on those who would change the human constitution, not on those who would leave it alone.**Bioconservatism** is the view that deliberate biotechnological alteration of human nature should meet a strong presumption against it, and that some such alterations should be refused outright rather than regulated. The label was coined in transhumanist circles in the early 2000s and is used mostly by opponents of the position; few of the writers it describes adopt it. They share a structure of argument rather than a politics: the burden of justification rests on those who would change the human constitution, not on those who would leave it alone. ## The core arguments## The core arguments Four distinct arguments run under the heading, and they are frequently confused.Four distinct arguments run under the heading, and they are often confused with one another. **Human dignity.** Francis Fukuyama's version holds that equal moral and political rights rest on a complex of species characteristics — he calls it Factor X — which is not reducible to any single trait and which would be fragmented by selective modification.[^fukuyama2002] He named transhumanism the world's most dangerous idea in a 2004 magazine symposium, on the ground that a society containing beings of engineered and unengineered kinds would have no stable basis for treating its members as equals.**Human dignity.** Francis Fukuyama's version holds that equal moral and political rights rest on a complex of species characteristics, which he calls Factor X; it is not reducible to any single trait, and selective modification would fragment it.[^fukuyama2002] He named transhumanism the world's most dangerous idea in a 2004 *Foreign Policy* symposium, on the ground that a society containing beings of engineered and unengineered kinds would have no stable basis for treating its members as equals.[^fukuyama2004] **The given and the made.** Jürgen Habermas argues that a person who learns their dispositions were chosen by another to a design stands in an asymmetric relation to that designer which no naturally born person occupies, and that the symmetry of mutual recognition among free and equal persons depends on nobody having authored anybody.[^habermas2003] Michael Sandel's related case against perfection is developed in [[bioethics-of-enhancement]].**The given and the made.** Jürgen Habermas argues that a person who learns their dispositions were chosen by another to a design stands in an asymmetric relation to that designer which no naturally born person occupies, and that the symmetry of mutual recognition among free and equal persons depends on nobody having authored anybody.[^habermas2003] Michael Sandel's related case against perfection is developed in [[bioethics-of-enhancement]]. **Precaution about complex systems.** Bill McKibben's *Enough* makes an environmentalist argument: interventions in systems that are not understood have a poor track record, human biology is such a system, and germline changes are irreversible in a way that ordinary technological mistakes are not.[^mckibben2003] This strand is the closest to the [[precautionary-principle]] as it operates in environmental law.**Precaution about complex systems.** Bill McKibben's *Enough* makes an environmentalist argument: interventions in systems that are not understood have a poor track record, human biology is such a system, and germline changes are irreversible in a way that ordinary technological mistakes are not.[^mckibben2003] This strand is the closest to the [[precautionary-principle]] as it operates in environmental law. **Repugnance as evidence.** Leon Kass argued that visceral revulsion at practices like [[human-cloning]] may register a moral truth that argument has not yet articulated. The claim is the most widely criticised in the whole literature — historical repugnance has tracked prejudice at least as often as insight — and Kass's more substantial contributions, particularly the argument that mortality structures the meaning of a human life, do not depend on it. [[leon-kass]] treats his position in detail.**Repugnance as evidence.** Leon Kass argued that visceral revulsion at practices like [[human-cloning]] may register a moral truth that argument has not yet articulated. The claim is the most widely criticised in the whole literature, since historical repugnance has tracked prejudice at least as often as insight. Kass's more substantial contributions, particularly the argument that mortality structures the meaning of a human life, do not depend on it. [[leon-kass]] treats his position in detail. ## Strands## Strands Bioconservatism is not a single political tendency, and treating it as the religious right's position on biotechnology misdescribes it.Bioconservatism spans several political tendencies, and treating it as the religious right's position on biotechnology misdescribes it. The **religious** strand is the oldest and the most institutionally organised. Catholic teaching, set out in the 1987 instruction *Donum Vitae* and the 2008 instruction *Dignitas Personae*, opposes embryo destruction, most assisted reproduction, and heritable modification on grounds of the embryo's moral status. It is a specific and internally consistent position that generalises poorly to enhancement questions not involving embryos.The **religious** strand is the oldest and the most institutionally organised. Catholic teaching, set out in the 1987 instruction *Donum Vitae* and the 2008 instruction *Dignitas Personae*, opposes embryo destruction, most assisted reproduction, and heritable modification on grounds of the embryo's moral status. It is a specific and internally consistent position that generalises poorly to enhancement questions not involving embryos. The **secular-philosophical** strand — Kass, Fukuyama, Habermas, Sandel — argues from dignity, meaning, and social structure rather than from religious premises, though its critics dispute how much the arguments retain when the premises are removed.The **secular-philosophical** strand (Kass, Fukuyama, Habermas, Sandel) argues from dignity, meaning, and social structure rather than from religious premises, though its critics dispute how much the arguments retain when the premises are removed. The **left and feminist** strand opposes the same technologies for opposite reasons. Feminist critics of reproductive technology in the 1980s argued that it medicalised women's bodies and served the interests of clinics rather than patients. The Center for Genetics and Society, founded in 2001, opposes heritable modification and [[polygenic-embryo-screening]] from an explicitly progressive position centred on equality and the history of eugenics rather than on the sanctity of nature. Disability-rights scholarship supplies a further line, developed in [[disability-rights-and-enhancement]], which objects to selection against traits its authors regard as forms of human variation rather than defects.The **left and feminist** strand opposes the same technologies for opposite reasons. Feminist critics of reproductive technology in the 1980s argued that it medicalised women's bodies and served the interests of clinics rather than patients. The Center for Genetics and Society, founded in 2001, opposes heritable modification and [[polygenic-embryo-screening]] from an explicitly progressive position centred on equality and the history of eugenics rather than on the sanctity of nature. Disability-rights scholarship supplies a further line, developed in [[disability-rights-and-enhancement]], which objects to selection against traits its authors regard as forms of human variation rather than defects. > [!note] Not the same as opposing biotechnology> [!note] Distinct from opposing biotechnology> Almost every writer in this tradition supports therapeutic medicine, including [[somatic-gene-therapy]]. The dispute concerns modification of the germline, enhancement beyond species-typical function, and technologies that alter reproduction itself. Framing it as anti-science makes the actual disagreement invisible.> Almost every writer in this tradition supports therapeutic medicine, including [[somatic-gene-therapy]]. The dispute concerns modification of the germline, enhancement beyond species-typical function, and technologies that alter reproduction itself. Framing the position as anti-science hides the actual disagreement. ## Institutional influence## Institutional influence The position's high-water mark was the US President's Council on Bioethics, chaired by Kass from 2001 and continuing to 2009, whose 2003 report *Beyond Therapy* remains the fullest official statement of the case against enhancement.[^ptc2003] The Council was unusual among bioethics bodies in commissioning literary and philosophical material alongside technical review, and unusual in the criticism it drew: two members were not reappointed in 2004 after publicly dissenting from its stem-cell positions, prompting accusations that it had been assembled to reach conclusions. It was dissolved in 2009 and replaced by a body with a narrower, more procedural remit.The position's high-water mark was the US President's Council on Bioethics, which Kass chaired from 2001 and which continued until 2009. Its 2003 report *Beyond Therapy* remains the fullest official statement of the case against enhancement.[^ptc2003] The Council was unusual among bioethics bodies in commissioning literary and philosophical material alongside technical review. It also drew unusual criticism: two members were not reappointed in 2004 after publicly dissenting from its stem-cell positions, prompting accusations that it had been assembled to reach conclusions. It was dissolved in 2009 and replaced by a body with a narrower, more procedural remit. In law, bioconservative reasoning is visible in the German Embryo Protection Act, in the Council of Europe's Oviedo Convention prohibition on heritable modification, and in the US restrictions described in [[governance-of-genome-editing]]. In practice these instruments were mostly drafted in response to cloning and embryo research rather than to enhancement, and they constrain what may be done to embryos far more tightly than what may be done to adults.In law, bioconservative reasoning is visible in the German Embryo Protection Act, in the Council of Europe's Oviedo Convention prohibition on heritable modification, and in the US restrictions described in [[governance-of-genome-editing]]. In practice these instruments were mostly drafted in response to cloning and embryo research rather than to enhancement, and they constrain what may be done to embryos far more tightly than what may be done to adults. ## Criticism## Criticism The standard objection is status-quo bias. Nick Bostrom and Toby Ord proposed a diagnostic: if a proposal to increase some parameter is judged bad, ask whether decreasing it would also be judged bad. If both directions are bad, either the current value happens to be optimal — which requires an argument — or the judgment is tracking the fact of change rather than its content.[^bo2006] Applied to memory, disease resistance, or lifespan, the test is uncomfortable for anyone who would refuse an increase while also refusing a decrease. [[nick-bostrom]] and the broader movement described in [[transhumanism]] treat it as decisive; bioconservatives reply that it assumes traits are separable parameters rather than components of an integrated form of life, which is precisely the point at issue.The standard objection is status-quo bias. Nick Bostrom and Toby Ord proposed a diagnostic: if a proposal to increase some parameter is judged bad, ask whether decreasing it would also be judged bad. If both directions are bad, then either the current value happens to be optimal, which requires an argument, or the judgment is tracking the fact of change rather than its content.[^bo2006] Applied to memory, disease resistance, or lifespan, the test is uncomfortable for anyone who would refuse an increase while also refusing a decrease. [[nick-bostrom]] and the broader movement described in [[transhumanism]] treat it as decisive; bioconservatives reply that it assumes traits are separable parameters rather than components of an integrated form of life, and that this assumption is the point at issue. A second criticism is that appeals to nature treat evolution as if it were a designer with good judgment. Evolution optimises for reproductive fitness in ancestral conditions, not for wellbeing, and the resulting body is full of arrangements no engineer would defend. A third is empirical: the technologies most often invoked as imminent have repeatedly failed to arrive, so that decades of argument have been conducted about capabilities that remain out of reach.A second criticism is that appeals to nature treat evolution as if it were a designer with good judgment. Evolution optimises for reproductive fitness in ancestral conditions rather than for wellbeing, and the resulting body is full of arrangements no engineer would defend. A third is empirical: the technologies most often invoked as imminent have repeatedly failed to arrive, so that decades of argument have been conducted about capabilities that remain out of reach. ## Where the position has been vindicated## Where the position has been vindicated Bioconservatism has a better predictive record than its opponents usually concede, and the vindications are specific rather than general.Bioconservatism has a better predictive record than its opponents usually concede, though the vindications are specific rather than general. The [[he-jiankui-affair]] confirmed that professional self-regulation of the kind inherited from the [[asilomar-conference]] does not bind a determined actor, and that the first heritable edits would be performed without medical justification, without adequate consent, and without the technical safeguards the field had described as prerequisites. Unregulated stem-cell clinics have caused blindness and death while operating in regulatory gaps. Clinics selling young-plasma infusions on the strength of mouse experiments prompted an explicit US regulatory warning in 2019; [[parabiosis-and-young-blood]] describes what the underlying science does and does not show. The tracheal-transplant scandal recounted in [[decellularized-scaffolds]] showed how far ahead of evidence a celebrated surgeon could operate before institutions responded.The [[he-jiankui-affair]] confirmed that professional self-regulation of the kind inherited from the [[asilomar-conference]] does not bind a determined actor, and that the first heritable edits would be performed without medical justification, without adequate consent, and without the technical safeguards the field had described as prerequisites. Unregulated stem-cell clinics have caused serious harm while operating in regulatory gaps: three patients treated at one US clinic for macular degeneration lost most of their sight after intravitreal injection of fat-derived cells sold as stem-cell therapy.[^kuriyan2017] Clinics selling young-plasma infusions on the strength of mouse experiments prompted an explicit warning from the US Food and Drug Administration in 2019, which said the infusions had no proven benefit for ageing or dementia and carried the risks of any large-volume plasma transfusion;[^fda2019] [[parabiosis-and-young-blood]] describes what the underlying science does and does not show. The tracheal-transplant scandal recounted in [[decellularized-scaffolds]] showed how far ahead of evidence a celebrated surgeon could operate before institutions responded. None of these vindicates the dignity argument or the repugnance argument. What they vindicate is the narrower claim that enthusiasm systematically outruns evidence in this field, and that the actors most confident about timelines have generally been wrong. Whether that supports a presumption against modification or merely a demand for better regulation is the question the two camps have never resolved, and it is not obvious that any amount of further argument would settle it — the disagreement appears to rest on prior judgments about how much risk a society should accept in exchange for capability it cannot yet evaluate.None of these vindicates the dignity argument or the repugnance argument. They vindicate only the narrower claim that enthusiasm systematically outruns evidence in this field, and that the actors most confident about timelines have generally been wrong. Whether that supports a presumption against modification or merely a demand for better regulation is the question the two camps have never resolved, and further argument may never settle it. The disagreement appears to rest on prior judgments about how much risk a society should accept in exchange for capability it cannot yet evaluate. ## See also## See also lines 89–93 → 88–9512 unchanged lines not shown
[^habermas2003]: `book` Habermas, J. *The Future of Human Nature*. Polity Press, 2003.[^habermas2003]: `book` Habermas, J. *The Future of Human Nature*. Polity Press, 2003.[^mckibben2003]: `book` McKibben, B. *Enough: Staying Human in an Engineered Age*. Times Books, 2003.[^mckibben2003]: `book` McKibben, B. *Enough: Staying Human in an Engineered Age*. Times Books, 2003.[^ptc2003]: `report` President's Council on Bioethics. *Beyond Therapy: Biotechnology and the Pursuit of Happiness*. Washington, DC, 2003. {An advisory report to a US president, written by appointees of the administration that convened the council, not by a scientific consensus body.}[^ptc2003]: `report` President's Council on Bioethics. *Beyond Therapy: Biotechnology and the Pursuit of Happiness*. Washington, DC, 2003. {An advisory report to a US president, written by appointees of the administration that convened the council, not by a scientific consensus body.}[^fukuyama2004]: `news` Fukuyama, F. "Transhumanism." In "The World's Most Dangerous Ideas," *Foreign Policy*, September–October 2004. {A short contribution to a magazine symposium in which eight writers were each asked to name a dangerous idea; it asserts the position rather than arguing it at length.}[^kuriyan2017]: `paper` Kuriyan, A.E. et al. "Vision Loss after Intravitreal Injection of Autologous 'Stem Cells' for AMD." *New England Journal of Medicine*, 2017. {A three-patient case series from a single clinic; it documents what happened to those patients and does not estimate how often such harm occurs.}[^fda2019]: `regulator` US Food and Drug Administration. "Statement from FDA Commissioner Scott Gottlieb, M.D., and Director of FDA's Center for Biologics Evaluation and Research Peter Marks, M.D., Ph.D., cautioning consumers against receiving young donor plasma infusions that are promoted as unproven treatment for varying conditions." 19 February 2019. {A consumer safety communication, not an enforcement action or a review of the underlying biology.}[^bo2006]: `paper` Bostrom, N. and Ord, T. "The Reversal Test: Eliminating Status Quo Bias in Applied Ethics." *Ethics*, 2006. {The test diagnoses status-quo bias in a judgment; it does not by itself show that any particular enhancement would be beneficial.}[^bo2006]: `paper` Bostrom, N. and Ord, T. "The Reversal Test: Eliminating Status Quo Bias in Applied Ethics." *Ethics*, 2006. {The test diagnoses status-quo bias in a judgment; it does not by itself show that any particular enhancement would be beneficial.} removed, struck through added, underlinedLine numbers count the serialised markdown of each revision, frontmatter included.
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