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Communism kills people.

There you have it - end of story. As Mr. Lane comments,

Marxism is intellectualism for stupid people; it tends to attract the sort who can’t understand that an economic system that cannot feed its own population reliably has failed at the game of Life. Literally.

Addendum: Just in case the point isn't entirely clear, I'll echo some choice comments on the subject of defending Communism from Billy Hollis over at Questions and Observations:

First, saying that their ideology produces results just as bad or worse as Nazism isn’t calling them a Nazi. It’s stating the clear truth.

But there’s an even better reason to treat their "creed" with complete contempt. Behaving otherwise makes their beliefs acceptable, even respectable, in academia.

Those beliefs should not be respectable. It’s time their ideology joined phlogiston, the luminiferous ether, phrenology, and Lamarkian biology in the historical gallery of failed concepts. They shouldn’t be coddled for believing in nonsense; they should be ridiculed for it.

Giving them any respect whatsoever means that get to continue to indoctrinate new generations in the same idiocy, meaning we still have the problem of academic idiots pushing an evil, failed ideology into the indefinite future.

Far better, I believe, to make it clear and obvious that their belief is not a respectable one.