One does not have to bomb all 300+ sites; there are a handful of sites that could be attacked that would destroy their nuke capability for years, enough time for the Iranians to Regime Change their own country for the benefit of the world.
If the sites are bombed and the regime is still in power I garantee you that the hell is going to break loose.
With ready mercenaries and cells all over the world they are able to make it happen. The have predicted all these steps as they had this planing from the early days of revolution.
I dont even wnat to think of the consequenses if the regime is still in power after being attacked. It would be like a hurt beast ready to to everything...