This question has been in the news recently, in light of the recent House Committee hearings on "Holding Campus Leaders Accountable and Confronting Antisemitism." A few thoughts on my part:
[1.] There's no "advocacy of genocide" exception to the First Amendment, or to the contractual promises of student free speech that many private universities rightly implement.
[2.] Indeed, as I've argued before, it is important that students be free to debate what is proper to do in war, and what wars are just. War involves mass killing, in some wars by the millions. I think some such killing is atrocity and some is just. But different people draw the lines differently, and that is a matter that is quite rightly up for debate.
