This essay by JT Young is right on.
Socially correct was the preferred phrase of the Nazis (the national socialists) and politically correct was the Russky choice (commies).
Political correctness is about it’s about totalitarian censorship of intellectual and social discourse, so when the language and behavior are censored tyranny reigns.
http://spectator.org/articles/58416/political-correctness-antithesis-science
PC kills. Ft Hood 13, Boston Marathon, even 911, perps deliberately overlooked because we did not want to “offend a minority”.