No, the protestors are some of the nicest people you’ll ever meet. They are dedicated to non-violence.
Of course, there is always the threat of plants, and I have no doubt that some entities will try to make the OWS movement look bad by infiltrating it and attempting to make them look violent, unfocused, and ridiculous.
You can tell the OWS movement is right on target because the financial industry is desperately trying to convince people that Washington is the problem. They are out there in large numbers trying to divert attention away from themselves (like they managed to do with the Tea Party), but the OWS folks are wise to their tactics and will remain on target.
The financial industry needs to be taken out of politics. As it stands, they own Washington. Washington doesn’t control Wall Street; Wall Street controls Washington, which is why the pressure needs to be placed squarely on the financial industry.