When protests become mob rule

The politics of hating the "rich" or hating the "system" was ultimately exemplified by two movements - Marxism and Anarchism. The former resulted in the emergence of repressive communist regimes, whereas the latter is associated with the purposeless terrorism that wrecked the Europe in the second half of the XIXth century and the beginning of the XXth.

Whether the "Occupy Wall Street" (OWS) movement will repeat any of these excesses is yet to be seen, but its anarchist and occasionally Marxist tendencies are obvious.

Here is a liberal take on the issue (naturally downplaying the potential for violence):
"Now, this is definitely not the kind of anarchism that inspired terrorists a century ago to murder presidents and princes, and which was depicted in editorial cartoons as the faith of red-eyed men with heavy beards and bombs hidden inside their shabby coats. Instead, the anarchism that motivates some Occupiers today is ultra-egalitarian, radically environmentalist, effortlessly multicultural, and scrupulously non-violent. They are the cyber-clever progeny of Henry David Thoreau and Emma Goldman, streaming video and organizing flash mobs instead of writing essays about the wilderness or traveling around the country touting feminism and free love. The “horizontal” nature of a movement brought to life and sustained by social media fits snugly inside their anarchist vision of a future in which autonomous, self-governing communities would link up with one another, quite voluntarily of course."

And this is a conservative point of view:
"At what point does a protest movement become an excuse for camping? At what point is utopianism discredited by the seedy, dangerous, derelict fun fair it creates? At what point do the excesses of a movement become so prevalent that they can reasonably be called its essence? At what point do Democratic politicians need to repudiate a form of idealism that makes use of Molotov cocktails?

But there is some ideological coherence within OWS. Its collectivist people’s councils seem to have two main inspirations: socialism (often Marxist socialism) and anarchism. The two are sometimes in tension. They share, however, a belief that the capitalist system is a form of “institutionalized violence,” and that normal, democratic political methods, dominated by monied interests, are inadequate. Direct action is necessary to provoke the crisis that ignites the struggle that achieves the revolution."