Partial Apathy and Relativism

I've started to think about moral relativism again, so I dug out the paper I wrote on the general subject last semester. There, I argued that the psychological source of some forms of relativism is a sort of partial apathy. The position seemed plausible to me when applied to relativism involving predicates of personal taste (cf. Peter Lasersohn). It may account for relativism involving vague predicates (cf. Mark Richard). Partial apathy clearly is not the motivating factor for relativism involving future contingents (cf. John MacFarlane) or epistemic modals (cf. Egan, Hawthorne, and Weatherson). I'm trying to determine if I think the idea can apply to moral relativism. I give more explanation of this on my blog....