Moral Error Theory

Abstract

Two varieties of moral error theory are identified. According to the first—the internalism-based error theory—moral judgements are committed to the existence of categorical normative reasons for action. These are incompatible with plausible constraints on the relationship between one’s reasons and one’s psychology. So they do not exist. According to the second—the irreducibility-based error theory—moral judgements are committed to the existence of irreducibly normative properties and relations. These are incompatible with plausible assumptions about the constituents of the world. So they do not exist. The differences and commonalities between these two varieties of moral error theory are identified.