There's no reason that a nation would not want a nuclear capability if it was in its national interests. North Korea figures that its national interest includes just being able to say that it has a nuclear capability. Iran is the same. Iran is not going to attack anyone with a nuclear weapon even through a proxy. There's alot of hyperbole by and about Iran. It's necessary to sift through it.
I disagree about Iran not using nuclear weapons if they had them but, even if that were the case, them having nuclear weapons at all would have enough of a destabilizing effect.
Like I said before, it seems like you're basically saying, "Sure, let's do all we can to dissuade Iran from developing it's nuclear program but, if and when they eventually do have nuclear weapons, oh well."
