Neither is correlation with atrocities proof of the economic system NOT being ethical or the way we should run society.
The point is correlation is not causation, and in fact we KNOW that capitalism is better then previous systems.
We also know if no other system that works to replace capitalism yet, other then the previous and worse systems.
Well I've got bad news for ya, there's nothing any better that's yet been devised.
Human nature is not great, and barring a massive population collapse this is how it's gonna be.
And frankly, it's better then it's ever been in all of human history for those of us in the developed world.