Black on black gun deaths happen more frequently in the United States than any other developed country. That's not a race problem, that's a gun problem.
Not that I disagree with your overall argument, but in this particular case it's much more of a socioeconomic problem than a gun problem. Guns certainly don't help the situation, but you'd still see a larger rate of violence within poorer communities/demographics with or without guns. While it would help with lowering crime statistics, banning guns on its own would not address the underlying problem of income inequality, which in general perpetuates a culture of crime that goes on to use guns.