Note to pacifist/isolationists - This is PRECISELY why you do anything necessary to stop third world countries from gaining nuclear capability. Because once that genie is out of the bottle there's almost never a way to put it back. Once a rogue state gets its hands on a bomb, your military option goes out the window. Take NK for example - It's very satisfying to talk about the utter destruction we could put down on them but it would be so irresponsible of us to pre-emptively strike them that it's just out of the question. They might not be able to reach us with a weapon (yet) but they could certainly evaporate Seoul or maybe even Tokyo. Once an unstable state is armed the stakes are just too high to do anything but talk, sanction, coax, wait and try to destabilize. All very unsatisfying and defensive measures. They're now driving and we're left reacting.
This is why a realistic threat of a nuclear program in Iraq and now Iran merit(ed) a pre-emptive military response. Time is on their side. Dither and talk and sanction and you only give them time to develop that trump card. Once they've got it, we're screwed. The political debate over the fairness of us, a nuclear power, trying to dictate against that to others is just so ing irrelevant ... It's like arguing that if you the honest homeowner can have a gun then why shouldn't the criminal down the street? We're not ing about Britain or France or some other respectable civilized country that can be counted on to behave rationally ... We're talking about third-world dip s who are barely out of the trees now being armed with hydrogen bombs. It's expedient common sense, people. Stomp them out hard before they're armed otherwise you're left with the options of A.) Being blackmailed by them or B.) Trading cities.