Are you joking?! They are definitely fundamentalist fanatics, just replace one faith with another.
Wrong. North Korea is convinced by Mutual Assured Destruction (MAD). Their nuclear power gives them the ability to avoid an invasion but that's about it. The leaders in North Korea are busy enjoying the rewards and comforts that go with a dictatorship. Their bomb simply means there's not much we can do about it.
Iran is a totally different story. MAD means nothing to them because if they launch on Israel and they are wiped out in response they will have "died for Allah" and they immediately go to Paradise. In Ahmadinijad's mind he is doing his people a favor by assuring their demise in the name of Allah.
To the leaders of North Korea, the destruction of their nation means the end of their ability to live the high life and exploit the people. To the leaders of Iran the destruction of their nation in the name of Allah means an eternity banging virgins.
Remember....with Iran we are dealing with the mentality that put plastic "keys to Paradise" around the necks of their own children and marched them into minefields to clear a path for their soldiers. You think they are negotiating in good faith? Or do you think they are praying to God Obama gets re-elected 'cause they know good and damned well the only thing standing between them and a nuclear weapon right now is "President Romney"?