> He identifies “a tendency to move from the uncontroversial concept of moral relativism” — that, say, certain cultures at certain times hold certain moral valu

> He identifies “a tendency to move from the uncontroversial concept of moral relativism” — that, say, certain cultures at certain times hold certain moral values, and other cultures at other times hold other ones — “to a concept that is, in fact, incoherent, and that is to say that moral values can range indefinitely,” tethered to no objective basis. The existence of a tether is what he’s focused on here, it seems to me.