Today is the 50th anniversary of the Watts Riots (or Watts Rebellion, depending on your point of view). In that riot, 3,438 Anglenos were arrested, 1,032 were injured, and 34 died. This year (but not today) is also the 25th anniversary of another, less serious uprising, the Depeche Mode Riots, in which five people were treated for injuries.
Southern California has hosted its share of riots; there was the San Gabriel Mission Riot in 1785, the Chinese Massacre of 1871, the Zoot Suit Riots of 1943, the Cooper Do-nuts Uprising of 1959, the Sunset Strip Curfew Riots of 1966, the Black Cat Riot of 1967, the Huntington Beach Surf Riot of 1986, the Los Angeles Riots of 1992, the San Bernardino Punk Riot of 2006, the Anaheim Riots of 2012, and the another Huntington Beach Surf Riot in 2013. Some (most) were exacerbated by the authorities, and several were fueled by civil rights aspirations and/or racism. Only one that I know of was fueled by hormones, Anglophila, and ARP-2600s.