Ah, I was addressing the first sentence in particular, about the conflation of anti-Israel sentiment and antisemitism.
As for Columbia... no, there's zero reason to think they supported Hamas. There might well be antisemitism in the roots of this somewhere -- left-wing antisemitism is a real thing and didn't appear in response to Israel's treatment of Palestinians.
But there is zero reason to think that the people being harassed are antisemitic. That is a right-wing belief that all Muslims are terrorists.
Just to be clear about my perceptions: Israel does face serious terrorism from Muslim countries, and I think that this reaches American young people by being "washed" through anti-semitic (white) intellectuals. But attacking university students for their sincere and non-violent beliefs is horrific (even if I think that some of their beliefs are wrong).