Regardless of your political bent, this sort of shit is sickening and genuinely disturbing, particularly when it occurs at (as this did) at a university whose ostensible raison d'etre is to ventilate different ideas, offensive or not. I realise this event wasn't a 'debate' per se but nevertheless it's the ethos and optics that matter.
There's also the incredibly myopic immaturity inherent in using violence for the sole or primary purpose of silencing the speaker and signalling to others that violence is somehow an acceptable form of dialogue. The myopic absurdity of this is of course that it is a cycle that can never end if all participants share that view, ensuring that it is inevitably self-defeating. Violence can make sense under certain circumstances - coups, revolutions, wars - but in the context of mere rhetoric it's abhorrent to witness.
Just a grotesque reflection in a long list of them that we as a species, or very many of us - perhaps more than we want to admit - are extremely violent and brutal.
Sickening and sobering, and again you could plug in any speaker/polemicist from whichever part of the political spectrum in here and it would be no less true.