These guys don't won't an all out war with nukes by the crazies in Iran...They also know Israel is about as bad as anyone besides Americans .... they aren't stupid ...
You are assuming that Ahmadinejad is sane. I think he may want this very thing. Who is going to stop him? He would sacrifice Iran cause he would think he's going to usher in the 12th Imam and maybe be safe. If not, he'd still get his virgins. Not a rational enemy.