I I think that your second statement may be a misstatement of what you meant.
I do not believe that black men are more violent than white men.  I think that when people find themselves in certain circumstances, they often become violent.  I think that we ought to pay attention to the circumstances that create an atmosphere that promotes, or encourages violence, or make it likely and then work to change the circumstances.  
.Way back in the 70's (maybe you were too young then to have paid attention -- :-)  -- that's supposed to be a complement, by the way, given Americans' love affair with youth!), TIME magazine ran a series of articles, laying out how investment in schools and in good pre-school education was a much wiser and sounder investment than a focus on incarceration.  Yet, we have been building more prisons (and privatizing them), while letting inner city schools languish.