You can thank LBJ and the Great Society, too.
Anyone questioning the Christian doctrine of the Fall need only tune in and watch anarchy in New Orleans.
Take a group of poverty stricken people, put them on the government dole, crowd them in public "housing", teach them for a few generations that they are no more than the result of blind chance and evolutionary determinism,
mere mammals, remove all external coercive restraints.
Then sit back and watch fallen man in the state of nature. This is New Orleans. It reveals the deep folly of "progressive" secular humanism.