Human History written by Sylvester McMonkey McBean?

It appears that human history is being written by Dr. Suess's enterprising character Sylvester McMonkey McBean, the fix it up chappie who said, "You can't teach a sneetch."

I don't expect members of historically oppressed groups to have extraordinary powers of acceptance or even tolerance. Oppression often has the opposite effect on people. Still, imagine what it would be like if everyone who was part of a second class group and everyone who was persecuted or who's ancestors were persecuted actually applied the lessons of their people's suffering to the way they treated other groups. What if they would or could bypass self-loathing and other-loathing? Would pride in one's ancestry be so easily connected with violent tribalism?

What would happen when the next wave of immigrants meets the children of the previous wave?

What vortexes of bloodshed would lose their power to attract fresh meat?