As long as black people percieve past history as being relevant to their disadvantages in todays society then they will continue to feel aggrieved.
Yes if you are black you can get along very nicely but its also true to say that there are few blacks at the apex of large powerful corporations, or in the highest political offices.
Incarceration rates for blacks are higher, even when the offences are directly compared with white offenders the incarceration rates are higher.
Maybe when they feel more in control of US national policy they will not feel like victims.
I’m not justifying the way they feel, its just that many still feel they have little voice or power and look for reasons behind it.