So in order to ‘defend the rights of free speech of conservative speakers’ you would drown out the free speech of ‘vicious leftist activists’? In order to protect ideas that might offend, you would drown out shouts that might offend?
So far, there has been no massive ‘leftist vicious violence’ on Australian campuses. There have been no student scuffles that would rival the political struggles of the 60’s. Most of the ‘leftist viciousness’ that would ‘demand extra security’ these days seems to consist of shouting only. Since when do words hurt peaceful conservatives?

It seems they only speak up when their own agenda is threatened and can only mutter “sorry we cannot guarantee their security” when vociferous leftist mobs successfully prevent a peaceful event not to their liking.