protesting has rules and boundaries. you are allowed to organise and protest within those, and going outside of that is usually a civil office (like trespass) or a criminal one depending on what goes on. These students are likely committing trespass.
just being a student doesn’t give you permission to use college campuses as you want. if you break rules or laws, there’s consequences for that. if you believe that what you stand for is the most important thing, then you accept the consequences as a feature of what you’re campaigning for. If you don’t, then your heart isn’t really in it and you just want to do whatever you want and get away with it because you feel like that’s what you deserve.