The current right-wing American support for Israel demonstrates the influence of white evangelicals and their End Times theology on the Republican Party, more than anything. Additionally, the other side in the conflict are Muslims (for many on the Right, that means "terrorists", especially since 9/11), so there's that.
If I were a Jew or an Israeli I would want no connection to any cause that would use my religion or my country as a cats' paw for some alien agenda that has little to do with Israel and Judaism and everything to do with some half-baked prophecy that will do no good, if achieved, for Judaism or Israel. Part of that prophecy is the mass conversion of Jews to Christianity... something that would obliterate Judaism and make Israel a meaningless concept.
Let Jews be Jews.