How many times?

How many more times will Iranian President Mahmoud Ahmadinejad call for, forecast, portend or otherwise promise the destruction of Israel before anybody bothers to actually do something about it?

Hugh hinted at the same question yesterday: Article 51 of the United Nations charter expressly contemplayes self-defense after an attack, but when the threat is an existential one, that right must exist prior to the delivery of the destroying blow. The Security Council has not acted. Doesn't this empower Israel to do so?

Much like wondering how many licks does it take to get to the center of a Tootsie-Roll Pop (3, by the way), just how long will the Iranians be allowed to make direct and thinly-veiled threats at Israel?