mostly, the rate of violence of all kinds is directly related to the number of blacks living in any given area. It’s really not hard to figure out, just politically incorrect to do so.
It is not the number of blacks, it is the type of neighborhood. Black people, unfortunately, seem to be highly represented in those neighborhoods.
I do not have statistics handy, but I think that Black people living in middle class neighborhoods are no more problematic than white, Asian, or Hispanic people in those neighborhoods.