I wholeheartedly agree with this, but I also think we have to realize that protest, by its nature, is confrontational (even at its most peaceful) and public (its membership can't be controlled). I don't think there's any amount of training or good-intentions that will keep protest from slipping, though infrequently, into angry, isolated mobs. If we let the actions of an inevitable few color our conception of protest, we've equated their cause with such action, and essentially silenced their collective voice.