And what are these people accomplishing?
They're occupying public parks and preventing the citizens around there who pay for those parks with their tax dollars from using said parks (some people in Oakland are even now talking about occupying the public library, yeah, that helps their fellow citizens).
They're knowingly breaking laws and then calling foul when the police enforce said law. If you want things to remain peaceful, follow the law. If you you want a revolt, than fucking revolt and have some balls about it, don't throw a bottle and resist police, than get online and cry about police brutality.
At least the Tea Party got people elected into office, just unfortunately not enough. I don't know about you, but to me that's accomplishing something. And it was done without breaking any laws and while being peaceful (and not claiming to be peaceful while holding signs saying 'Kill the Rich!')