Scott Woodcock has levied a number of objections against Aristotelian naturalism which claims that ethical norms are grounded by reason and biology. His most recent “membership objection” is a synthesis of earlier objections and consists in a trilemma. If Aristotelian naturalists answer the first horn of the trilemma by stipulating that determinations of species-membership are grounded non-empirically, and the second horn of the trilemma by stipulating rationality is species-specific, then they are confronted by a moral outsider—someone who claims that they (...) have non-empirically determined their species membership and are thus guided by different norms of rationality than the rest of us. This permits the moral outsider to act heinously without moral sanction from Aristotelian naturalism. Critics have neglected Alasdair MacIntyre’s Aristotelian naturalism. And he has faced moral-outsider-type counterexamples before. I develop a new response to counterexamples MacIntyre’s account has faced and argue that MacIntyre’s Aristotelian naturalism is able to answer Woodcock’s membership objection. I do this by developing an empirical taxonomy-based approach that enables us to justify the moral outsider’s responsibilities while preserving the best of Aristotelian naturalism. (shrink)

The idea that some characteristics of an organism are explained by the organism's intrinsic nature, whilst others reflect the influence of the environment is an ancient one. It has even been argued that this distinction is itself part of the evolved psychology of the human species. The distinction played an important role in the history of philosophy as the locus of the dispute between Rationalism and Empiricism discussed in another entry in this encyclopedia. This entry, however, focuses on twentieth-century accounts (...) of the innate/acquired distinction. These accounts have for the most part been inspired by the sciences of mind and behaviour. (shrink)