Exactly, that is what spoils any good riot. People who are tired of oppression begin to resist, most of the times peacefully over and over again, and when peaceful protest and negotiation doesn't work...w00t, time to overthrow!
What cheapens these people's efforts, however, is the inevitability that in almost any riot, after the initial "legit" crowd comes through, douchebags who are either of the "FUCK YEAH, SHIT IS FREE!" or the "YEAH I'MA FUCKING BREAK SUMTHIN WIT DIS HEERE BRICK LIKE HULK CAUSE IT'S COOL!" crowd, and then after that the original message is lost or diluted at best.