Firstly, I do not beleive Iran shall build a bomb, as Fatwa (verdict) is issued by the Marjah (supreme authority, and in this case Ayatullah Khamenei). The fatwa is based on Islamic beleif that you only punish the guilty and a bomb kills many who are not. The reason shias in Pakistan do not retaliate to sunni (wahabi) suicide attacks can be traced here. But US and Israel is driving Iran into corner and the great risk is that the Ayatullah might have to issue a verdict to build a bomb in self defense. The best solution to this crisis is not war mongering but approaching Iran with respect, make it a part of world economy and the fruits of economic success will tame Iran suspicions and the world will be a much better place.
UN to hold off on separate Afghan bombing probe for now (Reuters)
from the article: Iran is too rational to attack Israel