It was ever thus in LA. Even at Santa Monica High in the '70s, the "Bloods" and "Beaners" were always at one another's throats, though I don't think they used weapons in class. Also, they were very much in the minority and could be controlled.
During the Rodney King riots in the '90s, I heard that Hispanics incited blacks to riot, then took over strategic positions, like major shopping malls, armed and quite dangerous. they did this to make a show of power. The police were so spooked that many left the force soon thereafter.
You'd think we had Sunni and Shi'ite idiots in LA, the animosity runs so high. What to do? No one's found an answer yet. But good-guy blacks and hispanics are doing great, have good jobs, rise to exec positions all over town.
People who have to work for a living don't tend to have time on their hands or the motivation to get involved in riots. Riots in the USA are not based on any good reason --- just boredom and a life of welfare handouts which means they're not going anywhere.