I think Eliezer is saying: We know on average what's right and what's wrong. It is part of being human. There are different versions of being human and thus our rights and wrongs are embedded in time and place. It is in the "Thickness" of living with others we know what and how to do. Mostly it is easy. Because morality is human. Stopping up and thinking about all this gives what Michael Vassar calls "Aack!!! Too... many... just so stories... bad evolutionary psychology... comment moderation... failing."