One problem is that so many jurisdictions have pulled the teeth of the police.
What in &^#@% do they think the criminal element is going to do? Do they think the drug dealers and gang-bangers are going to share pizza parties together?
If the 'leaders' in these cities had any gumption at all, they should Establish special anti-drug anti-gang units, that have some teeth, and no ifs, ands, or buts from the usual circles. They could be limited to just those crimes.
It seems like the gangs were slowed a bit by Elliott Ness and his "untouchables", back in the 1930s.