One of the most difficult things the world struggled to reconcile at the end of the Second World War was that the same Germany that had produced Bach and Goethe also spawned Hitler and Nazism. So, too, have Americans (especially Northerners, of whom I am one) tried to wrap their psyche around a South whose same womb carried Mark Twain, Eudora Welty, and the Ku Klux Klan and Jim Crow. Such contradictions defy reason and keep us up at night. Or they should.