Dalrymple has a short essay on modern conceptions of morality in the new issue of Standpoint magazine.
There is an asymmetry in our moral assessment of ourselves: goodness comes from within, badness from without. People, as a general rule, don’t ask for an explanation of their good behaviour: only their bad is mysterious to them. In many years of medical practice, no one has ever asked me, “Do you think it could be my childhood that makes me so nice, doctor?”