This is a false narrative. The left LOVES the Jewish people and most Jewish folks vote Dem. The problem is the left, being more diverse, also is the political party for Arab Americans. So you have competing interests at times which makes it hard for Dems to thread the needle.
The issue with Harvard is that they are a private university and do not have to be told what to do by the federal government. They can withhold funding but that funding is mostly for medical/scientific studies. And this is mostly about DEI. Harvard isn't getting rid of DEI. If that means Trump pulls their cancer research, so be it.