"Iran would cease to exist only twenty minutes after having carried out a nuclear attack on Israel". Is there any evidence that the US stands ready to launch a nuclear attack (in 20 minutes!) against a country that would drop a nuke on Israel?
Whether or not the US is willing to launch nukes, Israel has submaries that carry nuclear weapons and that likely would retaliate with them in case Israel get's nuked.
Israel has submaries that carry nuclear weapons
Not "has", but "is in the process of acquiring". I suspect that has much to do with the nuclear weapons that Iran does not want and is not building X-/
Besides, the easiest way to nuke Israel looks like this: a rusty freighter under the Panamian flag arrives into Tel Aviv. One minute after it docks, Tel Aviv is a radioactive crater. That's all the information you have -- what next, do you order a nuclear launch on Tehran? On which basis?
And, of course, a few nukes will not make a large country like Iran "cease to exist". Look at Japan.
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