First one has to accept that Iraq never had WMD to keep up with your logic.....tell THAT to Iran and the Kurds.
Ok fine.
Otherwise, I accept your premise....on one condition......that you agree, should it become clear that Iran HAS a nuclear weapon, that we turn the entire nation into a glass parking lot to prevent them using the weapon on us or our allies.
What part of preventative medicine don't you understand??? This is not a court of law, where one works "beyond a reasonable doubt", it is a high risk game of brinksmanship, where one has to act on the best info available, on instinct for self-preservation.
Iran with nukes is a DISASTER....much worse than North Korea (bad enough!!!)
Because the religious loons in Iran might well USE them....anywhere, including Toronto......or more likely a coastal city in the USA, most likely in Israel....