Islamic states must murder and maim their imagined foes since that is the nature of Islam. It can do no other.
Millions must die horribly for the leaders of the slumbering West to awake and take notice. The West can do no other, since that, too, is its nature.
Cheer up. Bush, Cheney, Rice, Blair, Berlusconi, and whoever will be the new Israeli PM (Netanyahu?) all understand the severity of the Iranian nuclear threat. They will move to destroy or disable the Iranian nuclear facilities before Iran can produce a nuclear weapon. But of course if a liberal DemocRAT such as HRC is elected POTUS in 2008, then all bets are off for the future and your scenario of catatrophe could actually happen.