I don't have much to contribute here personally; Just want ton ote that Yvain has an excellent diagram on the "inferrential distances" thing: http://squid314.livejournal.com/337475.html

(Also, the place he linked it from: http://slatestarcodex.com/2013/05/30/fetal-attraction-abortion-and-the-principle-of-charity/ is probably the more obviously relevant thing to moral debates in politics and the like.)