Gangs are a self-organizing principle when civilisation is falling to ruin and the moral order of the previous civilisation has collapsed. Without any sense of people, nation, responsibility, rites and ceremonies, gangs arise creating structures akin to these often perverse and depraved but filling a void that human beings cannot endure for long.
It's what happens when the government and society provides the incentive and acceptance of the breakdown of the family. The feminists have brainwashed women into thinking that men are not necessary to raise a family. Any woman who is trying to raise teenage boys finds out real quick how powerless they are against their teenage boys once they get into the drug culture or start hanging out with the gangsters.