Gangs of young men strutting and killing people is the default state for humanity. Civilization is what puts that under control. Until it doesn’t.
I would say that very large portions of the USA have lost some, if not all vestiges of civilization, and are now living like the cargo cult populations of the South Pacific. Wait, scratch that. That's wrong. The Cargo Cultists would at least build runways and towers out of mud. The feral population of American cannot and will not do even that.