An invading country, the U.S. simply had no right to be there or to kill anyone , any more than the other Western imperialist nations or Japan, or Nazi Germany, did. Scipione states that the South Vietnamese, not Americans, killed thousands in the Phoenix Program. They all died. There was never any reasonable establishment of the fact that any one of those individuals was, in fact, cooperating with the VC, but they all died and the majority were either tortured to death or things like thrown out of helicopters . It's the same with us.
Capitalism is based upon exploitation.
But I don't. I certainly detest capitalism, which has proven utterly incapable of providing a decent life for the vast majority of the human race. And I have great respect for the communist movement of the past. But socialism has failed to create an egalitarian society free from the horrible racism, exploitation and cruelty of capitalism. But socialism is, in fact, a mixture of elements of capitalism and communism, in which the capitalist elements came to predominate.