You're not wrong. We've been incredibly shitty domestically and internationally.

> Perhaps more than all other countries combined.

Uhhhh, yeah, not really. The last century or two, humanity's hands have been pretty collectively bathed in blood.

I'd say easily the most bloody are those of the British, whose oppression and exploitation is unmatched in modern history for how pervasive, long-running, and brutal it was. I'd guess figures well into "hundreds of millions", possibly a billion or more across the several centuries. People look at Blackwater and their ilk and think it was some sort of new boundary being crossed. East India Company for two and a half centuries placed large swaths of the world's populace under corporate rule and had its own standing army and navy.

Japan committed so many wartime atrocities during WW2 it's difficult to summarize or account for them all, and estimates go as high as 30M killed.

Stalin's regime is estimated to have killed around 20 million people.

Mao could have been responsible for as many as 40 million.

Then there's all manner of dictators in the Americas and Africa (some propped up by America, of course), the various southeast asian regimes (Indonesia for example) and so on.