I'll wager Israel must get 100% "buy in" from America with 100K+ of our troops next door.
I don't think the US will give it (either administration).
Scenario: Israel successfully destroys Iran's nuclear plant.
The arab world is guaranteed to go berserk and declare war on the big and little Satans.
Iran starts sending missiles Israel's way and simultaneously sends 200 thousand troops into...Iraq. The thousands of Jihadists in America begin to act. The current world record oil price of $45/barrel triples and the economy tanks, hard.
I think there are very specific reasons why we have an unprecedentd seven carrier battle groups 'on exercise' right now.