The mob actions (eg University Of Wisconsin-Madison, UC-Berkeley, Middlebury College) are very, very, much more serious as they presented "a clear and present danger of death or great bodily harm" to others. At UW the police were instructed to "not interfere". At Middlebury College the mob followed an invited speaker out of the cancelled meeting, attacked his auto and inflicted neck injuries on his faculty supporter. The danger by arson and other means at UC-Berkely have been widely reported.
It was the duty for University officials to call upon law enforcement agencies to use such force (Even deadly force) to suppress those mob actions. They failed of their "duty to protect".
That failure invokes the statutory and Natural Law right of others to use any level of force needed to immediately suppress such mob actions.