There are plenty of occasions when people of all skin colours have been targeted, persecuted, oppressed. Look at Europe or the history of the Home Nations. White people killed and took slaves from each other from ancient times up to early-modern. Skin colour meant nothing to the Saxons, Vikings, Romans, Celts, everyone really.

This perspective is very, very narrow and not in any way relevant outside of its own 21st Century US political context. Modern example: I'm from Northern Ireland and we know plenty of suffering at the hands of people who had the same skin colour as us... but I wouldn't imagine bringing this narrative to bear on a who Catholic joined our church and converted, just because some of his people in living memory took up arms and bombs against some of ours.