On Leftist Socio-Moral Incenctives

 http://www.iea.org.uk/blog/the-economics-of-political-correctness

This is rather an old notion on the Right: Leftism is driven largely by social status competition among its leaders, success being determined by achieved and sustained moral superiority. The moral nirvana toward which they strive is to out-Christian Jesus and out-communize Marx. The internal logic of Leftism drives it toward total insanity (for example, Mao's Cultural Revolution). Some Rightists have dubbed the culmination of this process the Left Singularity.

Jim has done considerable analysis of this crucial phenomenon: http://blog.jim.com/tag/left-singularity