This is what I was getting at. A university (of all places...) should not be in the business of strangling free speech, even if it is offensive. I still agree with the guidelines for restriction that Thucydides identified, in the case of free expression, as being the standard. After all, if you can't say it, then maybe you can't print it, either. And if it can't be printed, then maybe you shouldn't read it, either. And., if you shouldn't read it, then maybe we should ban it. So, what's the difference between the "liberal" who might want "Mein Kampf" removed from the library, and the "conservative" who wants "Das Kapital" removed?
(Yes...I know, bad use of terms "liberal" and "conservative" but they are serving as markers here...)
I disagree with Griffon that any call to action is inherently wrong and dangerous and should be banned, even if it is focused on a particular group (ie: "illegal immigrants"). But here is where we run into what may be the real problem, and what tends (I think) to reinforce Griffon's argument.
Maybe what we really fear is not the speaker at all, but the listeners. We fear that, in the right circumstances, words such as my first example (which don't actually call for violence) will inspire a section of the crowd to go off and commit violent acts against the group, even when that isn't what the speaker intended. Or, that if such expressions become commonplace, an environment will develop in which the "new normal" is to say it is OK to take action against that group, thus lowering the bar for more extreme forms of expression that actually do encourage violence.
So, we are assuming that a percentage of our society, upon hearing the first example, or something like it, will commit violence. Thus, (we say) we can't take the risk of allowing that speech in the first place, since we can't predict or control the consequences. Sort of like allowing smoking in an oil refinery: it might be OK, or it might be disastrous.
So, who decides what "that speech" is, and what are the guidelines? Ciould we allow (say...) full freedom in an academic setting, but not on the street?