For me the concern in discussions like this is that it seems like the implication is that if Americans aren't constantly ripping our hair out and rending our clothes over the genocide of the American Indians, we have no right to decry modern genocides, or something?
It was absolutely evil what the US government and the governments of the several States did to the American Indians. Just like it was evil what the US government and the governments of the several States did to black Americans. And it was evil when the US government decided to drop nuclear weapons on Japanese civilians twice after Germany was defeated, instead of for example near Japan but with no human fatalities. And on and on.
But that doesn't make it not evil or less evil what, for example, Putin is trying to do to Ukraine right now. Or the various military coups in Africa right now. Or the profiteering off curable diseases that multinational corporations are doing right now.
And an American ought to be able to criticize those things and call for peace without having to list every evil thing America has ever done first. And the evil things that America has done shouldn't prevent individual Americans from calling out evils that they see.
This false implication that not calling out America's past evil is the same as supporting it is chilling to good discussion.