Let's just say for the sake of arguement, you're correct. If Iran launches any long range missiles at Israel from their territory, whether it's a nuke, or not.....Hell will be unleashed on Iran.
I don't think the Muzzies in Iran care. They are going to look at it as a holy war and probably will hide behind women and children.
Israel will not nuke Iran in retaliation. If so, they could have done something in 91 when Saddam was launching missiles at Israel. There would be too much pressure on Israel to do nothing if they shoot down a missile.