Police presence does deter. My neighborhood has been invaded by gang turf wars precisely because police really cracked down on an adjoining area after a toddler was shot in crossfire.
I agree that courts and prisons are part of the problem. But policing tactics were changed by the Ballerina.
The only real solution is family and society. And not much hope there.
This thread is about using the National Guard. That’s foolish. None of the options are great.
It is the welfare state that allows this chaos. In an environment where if you don't perform productive work, you die, the gang bangers could not exist for long.