Abstract

This chapter focuses on one of the common fallacies in Western philosophy called 'naturalistic fallacy'. The naturalistic fallacy follows from one's metaphysical (metaethical) commitments rather than simply a general defect of reasoning. Unlike many fallacies – formal or informal – it is not likely that one will find the naturalistic fallacy in standard logic textbooks. The natural properties (e.g., pleasure) are logically and/or metaphysically distinct from normative or moral properties (e.g., goodness) and, thus, any identification of a natural property with a normative property would be defective. G.E. Moore's metaphysics of values (metaethics) disallows any movement from natural to non‐natural properties. He thinks of normative properties/objects as logically and metaphysically distinct from non‐natural properties/objects. Yet if one rejects the wider non‐naturalistic moral realism central to Moore's naturalistic fallacy, it seems possible to accept a movement from the natural to normative.