Blame, shmame. The question you should be asking is, if Iran has nuclear bombs, what will Israel, Saudi Arabia, Iraq et al. do about it. What should they do about it.
Israel has had nuclear weapons, unofficially, for decades. But now, if Iran has nuclear weapons, the arms race is on. And neither Qatar, Iran, Saudi Arabia or Iraq can be counted on, if they have nuclear bombs, not to use them.
If one of those countries attacks the other, you will be “not blaming” them while the world explodes. Happy fall-out.
Maybe they will all destroy each other, so the rest of the world can breathe a sigh of relief. They are all awful.