Nuclear technology, like all other kinds of technology, will only get cheaper and more accessible with time. Such is the blessing of Civilization.
Therefore, it is only a matter of time before Rogue States acquire nuclear weapons. Many Rogue States have been working towards this goal for many years.
As that day approaches when Rogue States acquire nuclear weapons, and with those weapons acquire the ability to perpetrate their horrors on a larger region, and force even greater concessions from the civilized world, it becomes ever more imperative to stop these states before they attain nuclear capabilities.
It's probably the case that Bush is rushing to shut these Rogue States down because there's not much time left to do so.
Can you imagine what kind of terms Iran could dictate in the Middle East, if they had nuclear weapons? Of course they're racing to finish them, because once they do... And of course we're racing to stop them, because if we don't...
This is the last lap of the race. All the runners are drawing on their reserves, using up their second wind, opening up for that final sprint to the finish line.
But the finish line has always been there, and the consequences of victory for either team are readily predicted and understood.
Bush doesn't want to give Iran time to complete its nuclear weapons program on their own schedule. And Iran knows that it needs to step up its schedule, because suddenly time is a factor.
If we'd ridden Libya, and Pakistan, and North Korea, and others hard about their nuclear ambitions twenty years ago, this wouldn't even be an issue. Letting them go unchecked for ANOTHER twenty years, now that they're so close to completion, would be stupid on a colossal scale.
Anyway, behold the Script:
ROGUE STATES WITH NUCLEAR AMBITIONS: The free world isn't very serious about putting a stop to our shenanigans, so there's no real rush with the "Credible Deterrent" program. Just as well, since our failed economies can't really afford both run-of-the-mill tyranny AND a nuclear program at the same time.
THE FREE WORLD: Actually, we're getting serious now.
ROGUE STATES: Quick! Step up the nuclear deterrent program, before the Free World finally shuts us down!
ASSHATS: See what you made the Rogue States do?