Universities obviously walk a fine line--they are on the one hand public institutions that should encourage a fierce discourse. On the other hand they are not beholden to every yahoo who want a podium. That's fair. I don't think there was a responsibility for Berkley to host Ann Coulter or Milo Yiannapoulos. However, when people take issue with political correctness on campus it is often because students are out of line. 

Milo is a crook. But starting a riot over his coming to speak his mind is not democratic behavior. And Milo--strictly speaking--did not start the riot. Milo is a troll! But the students--or the outside anarchists who egged them on--started the riot. Students, faculty, all of us don't have to listen to Milo. Shouldn't! But we also shouldn't throw massive hissy fits as if his existence and his views merited a violent reaction. 

The threat of coddled college students is overstated these days. However, the reaction some campuses have had reflects poorly on all students.