You’re a racist who supports unconstitutional laws.
The cultures in many parts of Africa are dysfunctional because the cultures were destroyed in the 1700s and 1800s.
I’m done with ya.
I think the word you're looking for is "improved". However, even improvements in culture can only accomplish so much.
You're also making a point that is orthogonal to the topic. Let's say their crime rates are stratospheric for cultural reasons. Are you the deux ex machina, the Hand of God, that will change their cultural predilections? It is what it is - we deal with the world as it is, not how we'd like it to be. The stats are pretty straightforward - regardless of cultural influences, whether Anglo-Saxon, Lusitanian (i.e. in black majority Brazil) or African, black populations tend to have far higher homicide rates than those of other races.
My speculative theory is that high level of criminality among blacks has to do with the relatively short duration of civilization in black Africa, meaning that hunter gatherers who saw other humans as prey got to propagate themselves, whereas in more established civilizations, where even petty thieves were executed or exiled pretty much right until the end of the 18th century, only the genes of those who played well with other humans survived until the present age. The wonderful thing about the modern welfare state is that where in the pre-welfare past, criminals generally failed to pass on their genes, now it's the law-abiding of all races who fail to do so.