Why should we give a rat's hindquarters if Iran nukes Israel? Israel will nuke back, and two pains in the butt will be temporarily anesthetized.
The arguments for preventing Iran from getting nuclear weapons are specious at best. We didn't invade North Korea when they lit a nuke, and their leader is a way bigger nut job than Ahmadinejad. Where were the moral outrage and demands for military action when Pakistan and India went nuclear? Not exactly the most politically stable countries, yet we allow their possession of nuclear weapons.
Once again, the matter really comes down to oil. We have a problem with a non-friendly country having nukes near our oil fields. We would certainly retaliate against a country using nukes against us or our allies, but in this part of the world it would mess with our energy supplies. That can't be tolerated. But to call it like it is might make the unwashed masses ask questions that the administration is uncomfortable addressing.
Please go back to your bread and circuses. There is nothing to see here.