Slouching Towards Oblivion

Thursday, August 07, 2014

Logical Fallacy #21 - Appeal To Nature


Some people use the phrase "naturalistic fallacy" or "appeal to nature" to characterize inferences of the form "This behaviour is natural; therefore, this behaviour is morally acceptable" or "This property is unnatural; therefore, this property is undesireable." Such inferences are common in discussions of homosexuality, environmentalism and veganism.

The naturalistic fallacy is the idea that what is found in nature is good. It was the basis for Social Darwinism, the belief that helping the poor and sick would get in the way of evolution, which depends on the survival of the fittest. Today, biologists denounce the Naturalistic Fallacy because they want to describe the natural world honestly, without people deriving morals about how we ought to behave (as in: If birds and beasts engage in adultery, infanticide, cannibalism, it must be OK). The moralistic fallacy is that what is good is found in nature. It lies behind the bad science in nature-documentary voiceovers: lions are mercy-killers of the weak and sick, mice feel no pain when cats eat them, dung beetles recycle dung to benefit the ecosystem and so on. It also lies behind the romantic belief that humans cannot harbor desires to kill, rape, lie, or steal because that would be too depressing or reactionary.[5]

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