The students involved in the assault should be disciplined by the school and prosecuted – a hard lesson in manners, but a necessary one apparently. I’m sure they pretend to support free speech when their leftist friends are the subject, but acts like this show their hypocrisy.
Side note: The Southern Poverty Law Center is hardly a centrist/unbiased organization. They aren’t alone in this judgment, of course, but relying on their opinion is just as fraught with natural objection as it is with most any other group.