Take a look on you-tube, last week a speaker at IIRC U of T was silenced by protesters pulling the fire alarm and causing  the building to be evacuated. I can remember that sort of stuff happening back when I was a student and that is more than two decades ago. They never get punished for it and every time that happens it emboldens them a little more. Small wonder that activism is expanding its reach when no responsibility is attached to it.