Revenge for slavery.
There isn’t hardly a black person that know wnythign about slavery. They hear the word as a dog whistle but they know nothing about it.
Revenge isn’t a motive, their low IQ savagery is. It compels them to act as savages, to eat hand to mouth, to destroy and not build, to do irrational things like destroy their own neighborhoods, to kill each other in large numbers, etc. There is no intellectual thought behind it that revenge requires.