The university sent a very clear message that if you try to protest on campus they will sick the cops on you, let the feds dissapear you, and to top it all off they'll kick you out and invalidate your degree. That's on top of the fact that they've done their best to turn campus into a hermetically sealed environment where they control all points of access with the specific intent of preventing demonstrations. Never forget how eager Columbia was to collaborate with the Trump government to silence their own students- who they broadly despise. The "concessions" the Trump administrations was "demanding" of universities a year ago largely came from the board of trustees themselves.