We should globally promote nuclear disarmament, but that doesn't begin nor does it end with Iran. It begins with the United States and Russia, two nations owning the VAST majority of nuclear weapons (and the only one to actually have used them is the US).
We should concern ourselves with the missing nuclear weapons of the Cold War. Going to war with Iran while we ally ourselves with India, Pakistan, China, Russia, and Turkey is both ludicrous and extremely hypocritical.
We need to get out of the Middle East and remind ourselves of the deadly consequences trying to dictate the domestic policy of other countries.