It's because evangelicals dominate GOP primaries, AFAIK the vast majority believe Jerusalem is paramount for Jesus return, because of that, Israel > America as Jesus > America.
The best part of all this is, generally only GOP/right leaning people are the ones concerned with anti-semitism on colleges and support safeguards for jewish...
Because previously the marxist professors and student body were only attacking everything white/American, which is totally acceptable and brought in record donations by the same people who believe...