Politicians, particularly Democrat politicians from large metropolitan areas, simply don't care about fixing the problem. It's too hard. It's easier to demonize law abiding citizens, and blame inanimate objects than to actually fix something that is going to require work and possibly annoy your largest voting bloc.
Let's face facts, It's all whitey's fault that these poor downtrodden & misunderstood children feel the need to form gangs in the first place. Hey pal, just be quiet and keep paying your taxes.