The incidents of violence are the result of deliberate and planned provocation.
As a number of sympathizers and organizers have said, in public, they need the police to hurt someone to keep this going. The exact phrase in one case, which I posted on, was "another Kent State."
They need the violence to keep this crap rolling in the media, and will provoke or invent it if they have to. The one person who's been seriously injured so far has been milked like you wouldn't believe. Look at their websites.
Watch Oakland tomorrow. Oakland has been selected by the organizers as the major focal point.