Wisdom of repugnance
The wisdom of repugnance, or the yuck factor, also known informally as "appeal to disgust", is the belief that an intuitive (or "deep-seated") negative response to some thing, idea or practice should be interpreted as evidence for the intrinsically harmful or evil character of that thing. Furthermore, it refers to the notion that wisdom may manifest itself in feelings of disgust towards anything which lacks goodness or wisdom, though the feelings or the reasoning of such 'wisdom' may not be immediately explicable through reason.
Origin and usage 
The term[which?] was coined in 1997 by Leon Kass, chairman (2001–2005) of the President's Council on Bioethics, in an article in The New Republic, which was later expanded into a further (2001) article in the same magazine, and also incorporated into his 2002 book Life, Liberty, and the Defense of Dignity. Kass stated that disgust was not an argument per se, but went on to say that "in crucial cases...repugnance is the emotional expression of deep wisdom, beyond reason's power fully to articulate it."
The term remains largely confined to discussions of bioethics, and is somewhat related to the term "yuck factor". However, unlike the latter, it is used almost exclusively by those who accept its underlying premise; i.e., that repugnance does, in fact, indicate wisdom. It is thus often viewed as loaded language, and is primarily used by certain bioconservatives to justify their position.
The term has since migrated to other controversies, such as same-sex marriage, pornography, marijuana legalization, and alternative sexualities. In all cases, it expresses the view that one's "gut reaction" might justify objecting to some practice even in the absence of a persuasive rational case against that practice.
The wisdom of repugnance has been criticized, both as an example of a fallacious appeal to emotion and for an underlying premise which seems to reject rationalism. Although mainstream science concedes that a sense of disgust most likely evolved as a useful defense mechanism (e.g. in that it tends to prevent or prohibit potentially harmful behaviour such as incest, cannibalism, and coprophagia), social psychologists question whether the instinct can serve any moral or logical value when removed from the context in which it was originally acquired.
Martha Nussbaum explicitly opposes the concept of a disgust-based morality. Nussbaum notes that disgust has been used throughout history as a justification for persecution. For example, at various times racism, antisemitism, sexism, and homophobia have all been driven by popular repulsion.
Stephen Jay Gould has remarked that "our prejudices often overwhelm our limited information. [They] are so venerable, so reflexive, so much a part of our second nature, that we never stop to recognize their status as social decisions with radical alternatives — and we view them instead as given and obvious truths."
British bioethicist John Harris replied to Kass's view by arguing that, "there is no necessary connection between phenomena, attitudes, or actions that make us uneasy, or even those that disgust us, and those phenomena, attitudes, and actions that there are good reasons for judging unethical. Nor does it follow that those things we are confident are unethical must be prohibited by legislation or regulation."
See also 
- Appeal to emotion
- Ethical intuitionism
- Emotivism, which claims that all statements like "X is morally wrong" only express repugnance, not moral facts
- Moral panic
- Naturalistic fallacy
- Repugnancy costs
- Repugnant market
- Uncanny valley
- Cohen, Patricia (Jan 31, 2008). "Economists Dissect the ‘Yuck’ Factor". The New York Times.
- Nussbaum, Martha (July 15, 2004). Discussing Disgust. Interview with Reason. http://reason.com/archives/2004/07/15/discussing-disgust. Retrieved September 5, 2012.
- Kass, Leon R. (June 2, 1997). "The Wisdom of Repugnance". The New Republic 216 (22) (Washington, DC: CanWest). pp. 17–26.
- Kass, Leon R (May 21, 2001). "Preventing a Brave New World: Why We Should Ban Human Cloning Now". The New Republic 224 (21). pp. 30–39.
- Kass, Leon R. (2002). Life, Liberty, and the Defense of Dignity. Encounter Books. ISBN 1-893554-55-4.
- Nussbaum, Martha C. (August 6, 2004). "Danger to Human Dignity: The Revival of Disgust and Shame in the Law". The Chronicle of Higher Education. Washington, DC. Retrieved 2007-11-24.
- Gould, Stephen Jay (1997). Full House: The Spread of Excellence From Plato to Darwin. Harmony. ISBN 0-517-70849-3.
- Harris, John (1998). Clones, Genes, and Immortality: Ethics and the Genetic Revolution. Oxford: Oxford University Press. p. 37. ISBN 0-19-288080-2.
- Barrett, Grant (ed.) (June 23, 2005). "Squick". Double-Tongued Dictionary. Brooklyn, NY: Grant Barrett. Retrieved 2007-11-24.
- Hughes, James. "Repugnance Isn't Wisdom".[clarification needed]
- McGee, Glenn (2000). ""Playing God: Fears About Genetic Engineering"". The Perfect Baby: A Pragmatic Approach to Genetics (2nd ed. ed.). New York, NY: Rowman & Littlefield. ISBN 0-8476-9759-2. Reviewed in The Journal of the American Medical Association (subscription required; access date November 24, 2007)
- Parisi, Mike (March 26, 2004). "The Wisdom of Repugnance: A Critique of Leon Kass". Orion's Arm. pp. "Book Reviews" section. Archived from the original on 2007-09-27. Retrieved 2007-11-24.[unreliable source?]
- Bloom, Paul (July 22, 2004). "To Urgh Is Human". The Guardian. London and Manchester: Guardian Media Group. pp. "Science" section. Retrieved 2007-11-24.