Occam's Razor justifying our intuitive feelings about what's moral

Wait, what? Do you mean Simplified Humanism? I hope that's more of a description than a full argument. One could perhaps turn it into an argument by showing that our root values come from evolution - causally, not in the sense of moral reasons - and making a case that you would not expect them to have exceptions in those exact places.

Eliezer also makes a brief attempt to explain his opponents' motives. This may be true, but I don't think we should dwell on it.