Pakistan, unlike Iraq, will not be neutralised unless it becomes clear that they have an unstoppable intent to push the nuclear button.
We don't ever go to war with countries that actually have WMDs, or don't you read history? Why haven't we invaded Cuba again?
Why don't we take out China?
Iran knows this, and it doesn't matter how openly or secretly they struggle to get the bomb.That bomb is their only hope of survival.