 Evaluating the argument from queerness is well outwith the scope of the present entry. While Railton’s version of moral realism attempts to block Mackie’s overall argument by conceding his ontological claim whilst rejecting his conceptual claim, other versions of moral realism agree with Mackie’s conceptual claim but reject his ontological claim. Examples of the latter version, and attempts to provide the owed response to the argument from queerness, can be found in Smith (1994), Ch.6, and McDowell (1998), Chs 4–10.“Companions in Guilt” style responses attempt to undermine Mackie’s argument by suggesting that if it were sound, it would undermine much more than moral realism. For an example of such a strategy, see Cuneo (2007). For a general discussion, see Lillehammer (2010). 