Liberal city crime rates will drop in the ensuing years as there is less and less to steal until they become Havanas as you suggest.
It's funny you should mention that. I brought this up on a thread not too long ago when someone mentioned not hearing much out of Detroit on the crime front anymore.
First, of course, the much longer prison sentences handed out now compared to the 70s and 80s made a big difference. But Detroit, like East St. Louis, Gary, Flint, Newark, etc., are just are so gutted there's nothing left to fight over.
Your town has hit rock bottom when even the crack dealers leave because there isn't enough money in the economy of the town to sustain a market.
Cities like Chicago and Philly that still post big crime headlines are still functioning enough where the criminal class can thrive.
It's that gritty edge where the blue collar vice money meets the underclass where the explosions happened. Once that was gone it's pretty much reduced to impulse crime.