> You don't turn down a relationship with a country with Israel's military, technical and intelligence capabilities, and worth $5bn in bilateral trade

Well, that's certainly one angle.

The other angle is, let's face it, Israel is good at playing the Jewish card and portraying that if you're not pro-Israel you must be some sort of antisemite.

There are all sorts of political ties along those lines, e.g. "Conservative Friends of Israel"[1]

[1] https://en.wikipedia.org/wiki/Conservative_Friends_of_Israel