  It should be obvious that Blackburn’s argument is not entirely independent of the arguments for non-cognitivism that we have already surveyed. The claim that there is no analytic entailment from any natural property to any moral property is simply Hume’s Law – a datum often supported through use of the open question argument. Thus any reductive naturalist about moral properties will deny that premise of the argument along with the validity of the open question argument. (Dreier 1993) The thought that an explanation which involves the practical purposes to which moral judgments are put must favor non-cognitivism over cognitivism might well depend on accepting a Humean division between inert beliefs and motivating desires. Anti-Humeans just think that action-guiding purposes can be served by beliefs concerning genuine properties (McDowell 1981; Bromwich 2010; Swartzer 2013, 2018; van Roojen 1995). And cognitivists who agree that the analytic status of supervenience needs explanation will not need to deny that such explanations require claims about what the competent can believe; on many understandings of analyticity, analytic claims just are claims the linguistically competent must accept (Dreier 1993).