Leopold didn't "let ppl die". They tortured those folks. Cut off feet and hands and kept em as trinkets.

I agree. It is however in different contexts an interesting question which evil would weigh heavier: The one intentionally inflicted with a reason behind it, or the one inflicted out of callous disregard.
IIRC Chomsky made an argument about that that bombing the Al-Shifa factory should be considered a worse evil than the twin tower attack in the sense that both were terrorist attacks (as long as you recognize state terrorism as terrorism) with similar order of magnitude of death toll - however intentional killing in a perverted sense at least recognizes the human status of the victim, while the Clinton Administration simply did not consider it important that thousands would die in some poor african nation somewhere as a consequence.