They're liberal, have a disproportionately high amount of lower IQs, and I hate to say it but racially they're a bit fckd culture can ruin places. Grew up in southern California and experienced it first hand.
Discussion
Additionally, all areas in the US suffer from way way too many federal laws that CREATED ALL OF THE GANGS in the US
Black markets are the progeny of the Federal Government war on drugs
Gang violence is 100% about keeping control of drug markets
If you remove shithole cities from the stats, the US is less violent than Western Europe