It's not about freedom. It's about not putting others in potential danger. And for a free country, there seems to be a lot of "get the hell out if you don't hold the same thoughts and beliefs that I do." And don't pretend that you would pull the 'freedom card' if a group was burning the American flag. I know you people to be colossal hypocrites.
Me, not being a sociopath or an idiot, would see the potential danger in inviting extremists to attack a campus. You wanna burn a flag? Go at it. Just don't be selfish morons and endanger others along with you. If I made a statement by burning a flag and an extremist came to my school and murdered people, I would have a great deal of remorse and guilt. But I'm just strange like that.