I do think it is true that many Americans of more recent African heritage, being human, exhibit the typical traits that oppressed people tend to exhibit. Who could expect any group of people who had been singled out to be subjected to centuries of bondage slavery then segregation enforced by terror (not only the KKK and other such groups, but also the 'justice' system) to be any other way?
Individuals have transcended the societal roles and places assigned to the group, but it would be insane to expect every member of the group to do that--or even to be the least bit interested in doing it. I know absolutely that I wouldn't be. Making that effort validates in a way a society that requires extra effort from people in the oppressed group just to be 'allowed' to have a decent life.
Changing the system for the better would be easier than changing people for the better: "Same Economy, Way Better Outcomes for Society." Ultimately, what is needed is an advance in our understanding of justice: mutual respect as the ethic of justice.