Most of the _politicians_ in this country give undue importance to Israel. cf, Hillary's recent statement that she'll be better for Israel. They seem to fall over themselves to out-hawk the hawkish Israelis.
As far as the Iran deal is concerned: many top Israelis are actually in favor of this deal. See:
Yes. When I say "us" and "Israel" I'm referring to politicians who make up the leadership of both countries, and therefore are in the position to make decisions on behalf of both countries. I do not mean to generalize about the many diverse viewpoints that the people of both countries hold.