Oh! Oh! Is that library occupation and chanting what you're saying Columbia allowed? Gotcha.
If they "allowed" them to occupy a building, it wasn't illegal. Period. That's how law works. If I allow someone on my property, it's not trespassing. If I willingly shake someone's hand, it's not assault.
Chants -- including distasteful chants -- are protected by the Constitution. Assault and harassment are crimes and shame on them if they "allowed" that.
Chances are, Columbia didn't "allow" them or approve of them chanting specific things, they just didn't exact any consequences against them. Free speech is a tricky thing, which is why there have been countless cases before SCOTUS in the last 200+ years. It's complicated, and that's a good thing because it prevents such things from being decided based on the kneejerk emotional reactions of our President and his loyal herd. There's a point where it constitutes a threat and is illegal, but that's not your call, my call, or our President's call.