I'm not finding counts of deaths, nor listings of atrocities, for these. I think you're stretching the "monster" thing here; they're not in the same league as Lenin and Mao.

what makes you a monster is not that you killed millions, but that you were willing to do it in order to maintain your power

But if you believed that doing so was somehow right (again, the "greatest good" nonsense or something), then it's OK? That's nuts.