I'm not well versed in what is happening at specific campuses across the US - but if people not associated with the school (anyone not current students/Alumni) are protesting on Private property, the school is well within their rights to have trespassers removed.
Students should be allowed to peacefully protest on school grounds, or they can join non students protest that is off campus.
I'm not sure what the answer to Israel//Palestine is, but the US is absolutely directly funding and assisting in a genocide while publicly almost maybe finger wagging Netanyahu.
I would love to see North Americans actually tuck in to protest and figure out how to actually make them work. There's so much that needs to change but never will until actual consequences come for those responsible.