That's kind of a bullshit question in that it's easy to bullshit your way out of any possible legitimate challenge. The implication in the question is, of course, that capitalism never killed anyone, or at least a tiny fraction of those killed by communists. So, before we go any further, can I get an agreement that we're not going to trot out the tired old "but that's not really ~~communism~~ capitalism"? Because if we're not going to allow that argument for communism just because it wasn't the idealized, utopian version of it, then we ought not let imperfect capitalism slide.

Mind you, I'm a believer in free markets where they exist, but I also believe that it's important to be able to be critical of the things you believe in.