It happens. The racist democrat media just don't bother to report that part is all, and go light on the booking/morgue mugshot photo coverage.
USS Constellation mutiny, 1972
Zebra murders [Black Muslims]; San Francisco Oct 1973- April 1974: At LEAST 16 murders and 8 attempted murders; possibly as many as 80 additional successful murders linked: Zebra Killer JCX Simon:
Long Island Railway shooter Colin Ferguson [LIRR Massacre 07 December 1993; 6 killed, 19 wounded
Cook Brothers, Toledo, Ohio/1980s 9 killed; not tried until 1998.
Cleveland *Beat Up a White Kid Day*/ Melissa King, 2003 [No fatalities-yet]
Major Nidal Malik Hasan [Palistinian-American]; Ft Hood Massacre, 05 Nov 2009; 13 killed, 30 wounded
A couple of other mass murders that weren't shootings also come to mind. But over the years, there have been a fairly population-proportunate number.