Here’s the truth, from someone of a much higher IQ:

218. Various thinkers have pointed out that leftism is a kind of religion. Leftism is not a religion in the strict sense because leftist doctrine does not postulate the existence of any supernatural being. But, for the leftist, leftism plays a psychological role much like that which religion plays for some people. The leftist NEEDS to believe in leftism; it plays a vital role in his psychological economy. His beliefs are not easily modified by logic or facts. He has a deep conviction that leftism is morally Right with a capital R, and that he has not only a right but a duty to impose leftist morality on everyone.

223. Some readers may say, "This stuff about leftism is a lot of crap. I know John and Jane who are leftish types and they don't have all these totalitarian tendencies." It's quite true that many leftists, possibly even a numerical majority, are decent people who sincerely believe in tolerating others' values (up to a point) and wouldn't want to use high-handed methods to reach their social goals. Our remarks about leftism are not meant to apply to every individual leftist but to describe the general character of leftism as a movement. And the general character of a movement is not necessarily determined by the numerical proportions of the various kinds of people involved in the movement.

224. The people who rise to positions of power in leftist movements tend to be leftists of the most power- hungry type, because power-hungry people are those who strive hardest to get into positions of power. Once the power-hungry types have captured control of the movement, there are many leftists of a gentler breed who inwardly disapprove of many of the actions of the leaders, but cannot bring themselves to oppose them. They NEED their faith in the movement, and because they cannot give up this faith they go along with the leaders. True, SOME leftists do have the guts to oppose the totalitarian tendencies that emerge, but they generally lose, because the power-hungry types are better organized, are more ruthless and Machiavellian and have taken care to build themselves a strong power base.

(http://www.autoadmit.com/thread.php?thread_id=4603108&forum_id=2#40750829)