Blacks are the only ones that can kill blacks. The white people need to just be satisfied with inventing and making the weapons for them to be able to.
During the Apartheid, blacks were migrating from other African countries to South Africa. Why? because second class citizens in a country ruled by whites had much higher living standards than normal citizens in an average African country rule by blacks.
Right now black South Africans have worse living standards (and I mean education, healthcare, services and so) than during the Apartheid.
Blacks complain about racism, but they live worse in cities with lots of Blacks and few whites. The usual pattern is Blacks/Hispanic complaining about whites, and then going to white areas, and after a while, whites leaving. It's what's called "white flight". By the way, it seems that the white flight has been included inside the modern definition of racism too.
That irony has been there for a long while, but it won't change anything.
But with black into a neighborhood it is telling the other people there house is old and not worth repairing anymore. Its a time to go out and buy a new one.