" A cursory view of the daily news shows that violence and disruption is not exclusive to the left."
Then it should be easy for you to give examples of the right doing that - using violence and disruption -  to shut down free speech on campus in support of your claim that the right is responsible for a third of those occurrences. Yet in all this time you haven't. After numerous requests to do so. 
The only reasonable conclusion is that you can't. 
Why is that? Is there some conspiracy to hide these violent episodes by the campus right? In the absence of some explanation for that failure it is reasonable to conclude that the reason you cannot provide examples of right wing violence to stifle free speech on campus is because it simply doesn't happen.