Capitalism has caused hundreds of millions of deaths as well, without the same military interference that socialist countries have experienced. Your analysis needs a lot more nuance.
No one is proposing anything remotely similar to Stalinism/USSR-esque or Nazi socialism. When people bring those things up, it's a straw man.
America did it twice: native genocide and African slavery.
One thing I'm curious about...Trump says Let's make America Great again--was he talking before white people came and before the genocide? Or after? Was he talking about Slavery? Or the lynch mobs of the KKK? What about criminal enterprises and suffering during Prohibition and the Great Depression?
Damn, I long for the an FDR style leader to come along, well at this point we need quite a few to fill congress and start making America about the people again, not corporate interests.