Even using non-violent tactics against the establishment does not mean that thoughtful, liberal politicians will not respond with violence. Mayor Quan of Oakland admitted in an interview with the BBC that she had participated in "a conference call with 18 other cities" on how to end the Occupy encampments.
If you think these local city mayors are not taking orders from higher up the political machine chain, you just don't follow American politics closely enough. But here's the point - all these attacks do is give fuel to those small number in the protests who want to be violent. Throw one of us to the lions and three more step forward and one of those is not a non-violence player.
This is going to get more and more ugly. More arrests, more injuries and eventually there will be deaths. The police will resort to murder in defense of America's parks. But, of course, this has nothing to do with tents or parks or any physical aspect of Occupy. "They" are afraid we might succeed and their rape of the American and World economies will be stopped. It is all about money, power and greed. Those with all the stolen riches are scared and they are sending their minions to stop us.
They will not.