That is quite a gamble I'd say. Exhibit A: Pakistan.
Yes, look at their leadership before and after they got nukes.
Their populace is less so, but genuine US government incompetence rears its head again. We had the perfect opportunity to rectify that situation a few months ago, too, during the floods.
If you make people desperate, they will do desperate things.
In respects to NATO allies this has always been true, nuclear attack or no. Or, if you're saying Obama 'changed' that rule, I'd be skeptical that he alone would have the authority to do that. NATO members would have to vote on that as a unit. Unless I completely missed your point?
It has to do with reworking the treaty with regards to biological weapons. Pulling chemical weapons off of the nuclear response table is one thing, but saying "We might do it with this class of weapons" rather than an explicit yes or no creates uncertainty and that's not the sort of thing we like to have in policy making.
I don't think the ruling clerics will let ANYONE tell them what to do. And I sincerly doubt that the current administration and congress would respond in kind if Isreal got nuked. I'm sorry, I don't see Nancy Pelosi doing anything but wring her hands.
The ruling clerics are not stupid. It's not like they disbelieve in nuclear weapons.
And it is not Congress's decision to launch or prevent the launching of nukes. The only way for the Congressional branch to prevent a nuclear retaliation would be to declare a preemptive impeachment process of some sort.
And I very much doubt detonating a nuke will make the ruling clerics in Iran sane. I don't think they see things in the same cultural context as the western countries. They get a nuke, they'll treat it as just another 'big gun' to threaten folks with.
American policy does not fuck around on that score. If you launch nuclear weapons, you will be destroyed.
End of story.
Your fate is sealed the moment that weapon detonates on foreign soil. North Korea launches a nuke at Japan, Japan has no say in whether or not nuclear retaliation occurs. China has no say. Russia has no say. South Korea has no say.
Same goes for Iran. Iraq, Pakistan, Saudi Arabia - none of them have even the pull that Congress does, which is effectively zero.
No one wants to see these weapons used, ever again, and a part of that means a guaranteed destruction for anyone crazy enough to use them. They are purely a defensive arrangement, raising the cost of an attack of them. Attacking someone else with them, as it stands, is suicide.