Capitalism is responsible for chattel slavery in the Americas, the genocide of untold native populations in Asia, Africa, Ireland, the South Pacific and the Americas; famines and environmental destruction around the world; destroyed the stability of most of Africa, the Middle East, Central and South America; and it has rewarded bad behavior like pumping so much carbon into the atmosphere that we have irreversibly altered the climate of the entire planet. That's literally just skimming the surface - tetraethyl lead, CFCs, an anthology of chemical-related explosions and spills, the great Pacific garbage patch, depleted fisheries around the globe, the obesity crisis, the opioid crisis, the homelessness crisis, and so on.

I still stan (a version of) capitalism, I agree it's better than the other systems, but I do always get a giggle when people act like communism caused the worst disasters in history. They're not great, to be sure, but at least the Communists were mostly killing their own people through incompetence rather instead of killing the entire planet for avarice. It's humans all the way down, doesn't matter what system. Either you have accountability, or you don't and if you don't bad things happen.