You mean like in LA during the 1992 riots when shopkeepers were blasting away at the gang members?
YouTube - ‪LA Riots - Don't steal from Korean Store‬‏
Or back during the 1965 Watts riot when it got so bad the LAPD invented SWAT teams as a response? Or New Orleans during the aftermath of Katrina? Heck, Chicago or Detroit on hot Saturday nights?
Nah, it could never happen again. Those were just isolated incidents.