No hard proof, but it does not help when Iran continues to threaten Israel and her neighbors.
Iran is not responsible enough to acquire nuclear weapons... neither is North Korea... North Korea is a different situation.
Why do you have one rule for Israel and another for Iran? Why do you show favouritism for one.
Who makes you or the nations flags you are associating yourself with "god" in deciding who is and who isnt responsible? You have no right to be judge and jury on who has and who doesn't have nuclear weapons.
Iran has every right to protect itself and its citizens.