If Iran wiped out Israel, would that be enough for Carter to justify war?

Former President Jimmy Carter has told a conference of Nobel Peace Prize laureates in Chicago (I know, that's rich in and of itself) that there is not yet any justification for a war with Iran. War is only just when it is a "last resort" after "every other possible peaceful resolution" is exhausted, when all efforts are made to protect civilians, when the purpose of the conflict is to make the