It's incredibly easy to make non-standard patterns once you know how to solve it

You basically just agreed with what I said. Other than a few MCs, most of which remain pretty small when compared to other gangs, poor white areas don't suffer the gang problems that poor black and Latino areas suffer. However, if you really look into, many of the black gangs that exist today can trace their roots back to the civil rights movement. They were originally created as a way for minority neighborhoods to both police themselves and protect themselves from the corrupt white police. The problem here is that they didn't just disappear when the movement ended and their views got twisted and corrupted, they sometimes split into smaller gangs based on disagreements and then started killing each other over turf and money as well as robbing, selling drugs and killing anyone that got in their way or just happened to be around them when shit got bad. Having said all that, I think that if we could manage to take care of the gang problems, which isn't going to happen with the budgets a lot of the worst cities give to their police departments and all the protests, we would see a dramatic drop in black and Latino crime rates, possibly enough to be in line with white crime rates.