Violent protest is the dictatorship of the individual.
It begets the tyranny of the state. Confronted by violent citizens, government introduces more restrictive law, and tougher military policing, which the media and silent majority approve. The underlying issues are ignored and public debate refocuses around points of law and order. Democracy narrows and the rights and opportunities of aware and active citizens shrink. This law of revolutionary consequence happens as easily in mature, as in fledgling, democracies.