These cities can be fixed, IMO, but like with Venezuela, the remedy will be drastic. Cut local property taxes most of the way. The city government becomes all-volunteer, except for the police, who should be compensated for what they do. Abolish all local gun control laws. Let organizations like the Salvation Army run the social services — they will be much more efficient, and they’re mostly volunteer. Privatize the school system, preferably non-profit, so that poor parents can still send their kids there, with their own money or state vouchers.
And for Pete’s Sake, get rid of the race hustlers and come down hard on all the crooks, including those in the government.
In the middle of the 20th Century, Black people, in spite all of their hurdles and handicaps (segregation, etc.), were the most competitive people in the country. The way has only been downward ever since. Time to reverse that.