THE INTELLECTUAL ORIGINS OF AMERICA-BASHING: Lee Harris has an essay on the subject. Excerpt:

This is an intellectual tragedy. The Marxist left, whatever else one might say about it, has traditionally offered a valuable perspective from which even the greatest conservative thinkers have learned — including Schumpeter and Thomas Sowell. But if it cannot rid itself of its current penchant for fantasy ideology of the worst type, not only will it be incapable of serving this purpose; it will become worse than useless. It will become a justification for a return to that state of barbarism mankind has spent millennia struggling to transcend — a struggle that no one felt more keenly than Marx himself.

It has been a long time, of course, since Marxism had much to do with Marx.