It's absent father baby mama culture. It's genes. It's being beaten as a child. It's being not really wanted but only existing because the woman wanted a council flat.
Many blacks come from this background now - and it shows.
All these things create bullying, anger, bad attitude, violent criminality and blacks being disproportionately sent to prison.
The income thing does not apply anymore. If it did, explain this. As a poor white area becomes black, the crime rate rises. When it becomes fully black it becomes an official dangerous high crime area. I've watched this happen over and over.
It's not income, it's people, their ways and their culture.