I've said it before and I'll say it again; if you want to stop 13% of the population doing 50% of the crime, the solution is to give that 13% the same family and social structures that the other 87% have.
Ban divorce completely, or failing that, ban no-fault divorce. Criminalise adultery. Strongly encourage people to get married, by providing loans and government benefits to married couples. Make being a thug (yes, I know that's a pretty loaded term, but you know what I mean) socially unacceptable and help encourage poor people, both black and white, to start their own businesses. Go to black churches, help them remove pozzed priests and ministers, and give them money to set up parochial schools. Make churches (ideally "the Church", but I'm not naive enough to expect millions of black Americans to convert to Catholicism overnight) a pillar of black communities.
Would this require getting rid of the seperation of church and state, making a very conservative moral code law, and carrying out what lots of people would consider government overreach? Yes. Would it be worth it? Absolutely.