  What has always been attractive about Moorean non-naturalism is its capacity to combine the continuity and the difference into a coherent picture. There is room, at least, to account for moral thought's continuity with other thought by emphasizing that it is all a matter of attributing properties (albeit different properties) to things; and there is room too for locating the distinctive nature of moral thought in the putatively authoritative standing of the properties attributed. Of course leaving room for an account is not the same as actually providing one, and Moore himself does not actually offer much at all by way of an explanation of the normative authority (as we might call it) of moral properties. In any case, what has always been troubling about Moore's view is that the coherent picture that emerges seems to presuppose (i) the existence of metaphysically dubious properties that fall outside the causal nexus and, so, are such that (ii) it would be a complete mystery how we could every reliably learn anything about them, if they were to exist.  Moore, and the intuitionists who followed him, work in various ways to address these concerns. Error theorists, in contrast, hold that the coherent picture painted by Moore is, at least roughly, the right account of what moral thought and talk involves, but they go on to argue that the metaphysically and epistemically troubling implications of that picture properly undermine its credibility.  They argue that we have compelling reasons to reject the presuppositions of moral  thought.[12] 