It is common among the Right to look at Marxists as having evil hearts. This seems to me to be unfair. While they are correct for identifying Marxism as a bad thing, but we have to give people the benefit of a doubt. With the kinds of thinkers involved in that school of thought, we can't assume everyone was trying to do evil.
Rather it was time alone that showed Marxism to be a poor system. Libertarianism also needed time to sort out the problems in that system.