Which for most is just an excuse to steal.
That's exactly why it only takes a few people to start a full scale riot.
A few start the riot and others jump in for the fun.
News media then creates the spin as to the cause of the riot.
Most people don't remember, but one of the guys that hit Reginal Denny in the head with the brick said he didn't know anything about the not guilty verdict when he started rioting, and that was pretty much ground zero for the riot.
The LA riots were planned in advance, the not guilty verdict was just an excuse.