I agree with this. Milo Y. has no right to speak at Berkeley. He was granted permission to do so by the school, and that's their decision. But it's not an infringement of free speech to tell him he couldn't speak at the school. Free speech doesn't extend to "I can also go wherever I want to deliver my speech".
He has the right to speak, though. That doesn't mean he has the right to force people to hear him.
This is how I feel. He has a right to speak. He does not have a right to a platform. And if some one else owns a platform they have the right to allow him or not to allow him. And other people have the right to campaign and protest to convince the platform owner to not allow him.
I don't condone violence in the protest but as people said, the violent people were a third group coming in who just like to cause trouble. So it wasn't even the protestors so it's kinda a moot point.
The most effective peaceful protests involve self sacrifice as in you are willing to deal with bad effects the oppposing side might do to you. Trolling the side you dislike in a way to make you look innocent and cause them to display the behavior you are protesting. Which may mean they use that behavior against you (but in this way it makes them look evil and your cause more right). Ghandi and those protestors were cause they got to make the British government look bad through their own actions when reacting to the protestors. While they just looked like they were doing nothing wrong really. The idea is to get people to sympathize with you and more supporters (from people who may not have as strong an opinion. I've heard people argue these people just don't care but the point is to show them why they should care and to get them to care cause you have more chance of change if more people want it). Not just those who already agree with you (and to get those more supporters to along with you pressure the people you are protesting to stop when they get outnumbered).
I'm curious though, has there been cases of violent protests actually being effective (and we're not talking going outright to war. At that point everything has broken down into just settling it in who can cow the other side by show of force)?