It didn't have a "you will be bombed and invaded" penalty clause. Destabilizing every non Sunni hellhole in the middle-east has fucked up my backyard too much, I don't trust a word coming out of Israel and the US any more. We have to try something else now, I don't think it can be worse than the alternatives.
I don't buy the gloom and doom of Iranian nuclear weapons even if they did get them. I don't see it as a worse threat than the Likud mad dogs and their quest to get their promised land, they're getting ready to annex their previously ethnically cleansed Golan Heights right about now, or their Haredi cousins some of who literally think of me as little more than cattle and who could become a majority in a couple of decades.