I agree re the Iranians bringing an attack on themselves with recent utterances...but while a conventional attack can be justified, a first off pre-emptive nuke strike wouldn't be. The hatred you now see for Israel would be dwarfed by the post-war situation in that scenario. No moderate Arab government (Or secular dictatorships in our camp, ie Indonesia, etc) would survive. All Arab and Islamic states would focus on Israel, evenb the ones who have bnever really cared...ie Malaysia, Indonesia, etc.
Israel can get away with nukes only when they're attacked first or when they can visibly act against an attack which is evident. Most people still see the Iranian speech as saber-ratting...Heavy conventional attacks...yes....coup....yes...assassination....yes...nukes - only if Israel wants to open itself up to a worse strategic situation.
I hope and pray you are correct. But I think the phrase, "never again" is a significant part of the Israeli psyche... and the worst strategic situation is radioactive Tel Aviv.
Let's hope for the best...