The divesting idea is about the fact that the money we send there is contributing to death. I don't think we're as "invested" in Hamas in the first place, so it doesn't apply the same way.
There are plenty of pro-Israel protests on college campuses too where I'm sure people have talked about annexing Gaza, there just aren't as many students on Israel's side
Wait, how is Columbia supporting the war effort? They are protesting Columbia and asking them to divest. If Colombia was sending money to Israel for warfare or part of some arms research and development University I might understand it. Columbia uses an investment firm to manage a portfolio to keep their books in top fiscal shape and maximize endowments, that's their priority, that isn't an endorsement, that's just business. They also wanted Israel to stop partnerships with Israeli universities.
If I wanted to stop SeaWorld from exploiting mammals I don't go to the Tyson meatpacking plant a county over and protest them. Columbia has next to zero to do with the war in Israel just as Tyson has nothing to do with what happens at SeaWorld.
I think there are probably more on Israel's side if asked to pick one ......... They just aren't nearly as vocal, aggressive and extreme about it.
For what it's worth I think this needs to end, the sooner the better. But it isn't. Nobody wants Palestinians, even their own ethnic brothers and sisters. And they don't want to share the land and I can understand why they would feel that way. I also funny believe Israel wants to share the land either, especially now. Hell I don't know what the answer is.
Edit to add something I missed. You switched Hamas for Palestinians. We send a lot of money to Palestinians. That money goes to Hamas as fires virtually all aid to Palestinians.
But I do know that kicking this guy out, from the info I've read from the Internet, is counterproductive and an abuse of power, just plain wrong. Even though I don't understand the reasons for his protest of his University, it doesn't make it illegal or a reason to deport him.