There's no need, just look at the USSR and Haiti for great examples. A society run by leftists will eventually collapse on itself, and all the leftists die. A society where only the blacks rule will end up with the leftist allies who helped them getting raped/murdered and eventually the blacks will live in squalor. Zimbabwe took like less than 2 years from the whites leaving to the point where they ran out of rats and begged whites to come back.
There's no need, just look at the USSR and Haiti for great examples. A society run by leftists will eventually collapse on itself, and all the leftists die. A society where only the blacks rule will end up with the leftist allies who helped them getting raped/murdered and eventually the blacks will live in squalor. Zimbabwe took like less than 2 years from the whites leaving to the point where they ran out of rats and begged whites to come back.