Please, show me someone, anyone, who says they "didn't know" about these things

Ofc they know, bigotry and nationalism is something that's explicitly taught by bourgeois superstructures (media/schools/leftover protected tradition/etc). If it was a simple deal people had been offered for "comfort", there wouldn't be a need for bourgeois to drill into peasantoid minds the concept of a nation for a hundred years, or for them to create eugenics as a pseudoscience to justify racial supremacy...

This applies to every single nation in existence btw, not just US. Sweden still had state enforced eugenics until 2013

Nah, I'm just not going to take the responsibility for shit that happened before I was born. I know I know evil white privilege guy who doesn't hate everything about himself.