I found your OP to be full of misleading generalizations. There are genetic and social reasons why African-Americans tend to be more violent on average. These reasons have little to do with the wider black race. In fact, most African immigrants in the US outperform African Americans socioeconomically so there goes your premise. I'm giving your generic thread traction by debating you. You should be thanking me really.
Stereotypes exist for a reason my assumptions are largely correct. In my short time here threads like these are likely to be made by whites. Actually, Latin Americans contrary to popular opinion are the strongest demographic threat to America, even if African-Americans are a bad influence on society their share of the population is growing slower than Latino Americans.