"The Death of God and the Death of Morality," revised

It's quite a bit revised from earlier versions:  Jessica Berry (Georgia State) persuaded me that my treatment of moral responsibility and guilt was difficult to square with passages in the Genealogy; and Joshua Cohen and colleagues at Berkeley forced me to expand the critique of Rawls, though I still think Arneson's criticism is basically correct.  And many others helped on many points of detail, so with thanks to them all, here's a new version.