"the now hated mullahs"
I never understand why you aren't more anti-Iranian, Putin33. If you get so wound up about Christians opposing gay marriage and things like that how can a literal theocracy in Iran be held in anything but contempt by you? Forget about gay marriage, they actually execute homosexuals there.
'"I can see the upside for Israel, but I said I couldn't see an upside for Iran. Iran is pushing this and the only outcome if they don't stop development is going to be an Israeli attack. What does Iran get out of that?"
I misread you, SpeakerToAliens. Whoops.
To answer your question, I honestly don't know whether Iran would be strengthened or weakened in the aftermath of an Israeli strike. If I had to guess I'd say strengthened, since it would legally be aggression on Israel's part and much of the world needs little provocation to pile on Israel. In the event, however, that Iran did get nuclear weapons then they would pretty much be masters of everything between the Hindu Kush and the Nile.
Take Bahrain. This speck on the map with a population about equal to New Hampshire is mostly Shia and historically ruled by various Persian states. Its rulers and elites, however, are Sunni and it serves as a base for the US Navy in the Persian Gulf. Say some oppressed Shia group backed by Iran stages a successful coup. A nuclear Iran which guarantees this new regime's independence will complicate American or Saudi intervention. A Persian Gulf dominated by Iran is unacceptable to basically every other state in the region, so this crisis has the potential to escalate into a general war and would at the very least wreak havoc on the world economy.
Or, take Lebanon. Say Hezbollah launches a some sort of attack. Maybe it blows up the airport in Tel Aviv or kidnaps an Israeli Minister. Doesn't really matter for our purposes besides that it's something big. Big enough to warrant a serious invasion of Lebanon. Israel may not be able to effectively respond to a serious attack like that if Iran threatens nuclear retaliation should the IDF enter Lebanon. This could easily apply to Hamas in the Palestinian territories as well. What other country would be asked to tolerate such a position?
What I'm getting at is that Israel is right to fear a nuclear Iran. So does America, but to a lesser extent and for different reasons. Israel's interests are not the same as America's. They do overlap in areas, however. We're a long way from war being necessary from the American point of view, but possibly not that long from the Israeli.