One of my regular reads is Dr Sanity. The doctor who lists her occupation as an M.D. (Psychiatry/Aerospace medicine) has very pro-liberty views, and is very strongly opposed to the antics of the socialist left. What follows is an interesting argument (one of the best I have seen in a long time) for capitalism. This is quoted in her most recent post, but was originally from another post, “KARL MET SIGMUND AND THE REST IS POSTMODERN HISTORY.”
The Marxist intellectuals' big mistake was in not recognizing the difference between repression and suppression. And in not understanding the way psychological defense mechanisms work (particularly the healthy or 'mature' defense mechanisms such as sublimation, anticipation, humor, altruism and supression) .
They correctly noticed that the instinctual energy of the proletariat was being harnessed both for the individual's good as well as the society under capitalism; and yet were unable to appreciate the fact that unless you accept the reality of human nature and give it the freedom to transform all its most negative aspects into something positive for the individual and the culture/society (which is what the mature defenses do so creatively), then you end up crushing all human initiative, creativity, and productivity.
Societies can either encourage the development of these healthy, mature psychological defenses with which to cope with reality; or they can encourage the development and expression of the worse aspects of human nature--i.e., those which result in violence, racism, criminality and all the other pathologies. Either way, social, political and economic systems can only encourage certain human traits that result in civilized behavior; or, they can encourage those that are barbaric and antisocial. Human nature is the same, though, no matter what type of society or political system it finds itself in.
Simply put, totalitarian systems--whether from the left or the right (and that includes Marxism in any of its incarnations, whether religious or secular)-- actively promote the most negative, primitive, and immature aspects of human nature. In fact, they give a societal/institutional blessing to such behavior; and thrive on the resulting projection, paranoia, distortion, and denial of reality.