Fatwa or not is irrelevant. The Iranians have said that nuclear weapons would not provide security for them, and have insisted on a nuclear weapons-free mideast. The Neocons, ironically, agree that nuclear weapons would not provide security to Iran. Those who claim that Iran "must" want nuclear weapons since it lives in a dangerous neighborhood are engaging in a fallacy called Subverted Support -- trying to explain a phenomenon when there's no evidence that the phenomenon exists in the first place.