Spreading hate? I can think of someone else who's a master of doing that and gets masses of Americans to buy into it.
Antisemitism? Some of those protesting are Arabs, who are themselves semites. Protesting against Israel's policies isn't anti-Jewish or hate speech. It's protected speech under the Constitution.
Supporting Hamas? Not illegal unless it contravenes one or more of the very prescriptive laws that define support for terrorist organizations. These laws criminalize specific actions, not speech. I haven't seen any of the students charged with contravening any of those statutes.
Occupying universities? Universities can expel students for prohibited conduct and can charge outsiders with trespass. Expulsion would cancel a student visa, but a misdemeanor trespass may not always be enough to get a foreigner deported.
But again, some of the students are bing deported without being charged with any crime.