This extremist viewpoint eventually leads to canceling itself out. Since whiteys are bad because they "slaughtered with mass genocide the Native Americans", we cannot celebrate Thanksgiving anymore.
But wait! Native American tribes also slaughtered each other, sometimes wiping out an entire opposing tribe and taking their land. So therefore, Native Americans as a whole must be demonized (as whites are), and N. A. holidays must also become illegal and uncelebrated. At some point, we come to the realization that EVERY group of people has done something bad in the past, and ALL of them must have their traditions stripped away as a result. Then...we have nothing.
Political correctness is a road that leads to nowhere.
If you dwell on things that happened hundreds of years ago, you get the Balkans and their endless conflicts.
Wait, the peaceful Illini Indian tribe was wiped out by other peaceful Native American tribes? Never mind.