It has NOTHING to do with race...
(1) Poor people (of ANY color) often develop a culture of violence...
(2) This is how it starts...Poor woman gets pregnant...She has little education...So, she doesn't get the proper prenatal care, and she can't get the right nutrition...Her stress levels are THROUGH THE ROOF...Her body starts to release stress hormones...They affect how her embryo develops...
(3) The baby is born with a development disadvantage because of all the stress/poor nutrition the mother was going through...This disadvantage is made WORSE by an environment low on social resources...
(4) Now the child is considered "dumb" because he struggles at school...He looks around him, and all the "successful' people are criminals/entertainers...What do you think is probably going to happen?
(5) Race has NOTHING to do with it...It is a CULTURE thing...