(1) From the point of view of a liberal American, it seems a given. To have any negative opinion of Israeli politics in the States marks you as Not The In Crowd.
(2) I dunno - all I know is that American politicians represent the situation in this way. I know a few Israelis, but we've never talked politics and I've never been to Israel, sadly. So I'm woefully ignorant.
(3) We're never supposed to talk about that, are we? Only Evil Rogue Nations violate nuclear treaties they didn't sign, after all.
On your final paragraph - now I'm going to have to go read some things.