everynight and a dozen up front throwing bottles, rocks, firework etc at police and trying to pull down the fence, break back into the building, start fires etc, what do expect the police to do ? Invite them in ?
Unless you condone the violence, the police have to react.
They would give fair warning and declare an illegal assembly over the bull horns. Then ask the crowd to disperse and stated that they would use non-lethal derrents if the crowd didn't comply. We know the outcome of that excersize, night after night. The actions of the few ended up impacting everyone in the vicinity.