It is a process starting in 1930’s. The sexual revolution was not an accident....as FDR said, nothing in politics is an accident. They use Pavlov and Skinner to actually change the structure of the brain.
Eakman in Cloning of the American Mind explains the methodologies that are using psychology to change their values and thinking....most comes from Cognitive Dissonance which makes it nearly impossible to process information once you have been imbued with this. It ruins your thinking.
Political Correctness is cultural Marxism....it was started as a process to create cognitive dissonance and condition people into group think.
They become VERY UNCOMFORTABLE in going against group think (Maxist ideology)...some can never do it.
http://www.youtube.com/watch?v=mDDBZuheQxs
Thanks for posting the link. Speaking of methods to change thinking, this video of the famous Milgram experiment (Part 1 of 3; the others are readily available on Youtube) is a frightening (and at the same time somewhat humorous) example:
http://www.youtube.com/watch?v=t2PGnHHnRMk&feature=related
The Asch Experiment also provides fascinating examples of group think.