It is quite right to be worried and hesitant about entering a war with Iran. War, as recent events in Iraq and Afghanistan show, is a dangerous, bloody, often dirty mess in which things go wrong, civilians are killed inadvertently, your own side loses people, and goals are not necessarily achieved.
Once begun, such a conflict will go on for many years and take unexpected turns. Iran's regime would become desperate, vengeful, and concluding it had nothing to lose would be all the more determined to obtain nuclear weapons and far more likely to use them. Understanding that factor might not deter an attack completely but it should be very much taken into consideration in assessing what to do.
At any rate, while war with Iran might be eventually inevitable and necessary that’s not true at this moment, when Iran is far from being able to build nuclear weapons, much less deliver them on missiles. And such an operation genuinely does pose serious problems for Israel and also, even if it does not participate directly in any way, for the United States.
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On the positive side, not a single Arab state would lift a finger to help Iran. The moderates would be happy that Israel bombed Iranian nuclear facilities, hope it succeeded, and demand that the United States keep them out of any fighting. The radical Sunni Islamists would worry about the precedent and make some propaganda but view the Iranian regime as a rival, not a brother. The Turkish regime would foam at the mouth but do nothing while the Syrian regime, allied with Iran, is too preoccupied by a civil war and fears confrontation with Israel.
The most serious organized force on which Iran could depend would be Hizballah in Lebanon.
A different version of this article is published in the Jerusalem Post. Please read and link only to my blog which contains my fuller, better version of the text.