At the core of this ugly violence in Chicago is an ugly alliance between Chicago gangs and Chicago Dem politicians.
The gangs operate a highly profitable illegal drug trade. The gangs pay off the local Dem politicians to turn a blind eye. The gangs stay in power. The politicians stay in power. The average Joe Public is screwed.
https://www.chicagomag.com/Chicago-Magazine/January-2012/Gangs-and-Politicians-An-Unholy-Alliance/