What makes you say that? I've watched dozens of their debates. The audience members do not scream and cancel opinions they disagree with, although some may let out some groans, laughs or scattered applause. I don't know, but I've never read that they had to hire extra security for conservative speakers like in the U.S.
In recent times it’s become clear that the majority of the students are indoctrinated leftists. It’s not a matter of becoming violent, requiring protection from security. It’s more the level of regurgitation of left-wing thoughts, devoid of facts and reality.
So many are stuck on “criticize Islam = racism”. They’re literally hammered with this from every media direction, multiculturism being “good” as required thought.