In spite of all the Bull shyte hate propaganda, Iranians are not stupid. If they have the technical and scientific capacity to build a bomb, they also have the mental capacity to know that if they used it, it would be the end of their own lives. I see no reason to think that they are building it for any other reason than to protect themselves from attack, a deterrent just like everybody else. There are more things to be afraid of closer to home. If the Yanks should self destruct because of the ever widening rift of extreme polarization, who knows which radical loonies will gain control over various parts of their arsenal. If the US falls into chaos, all hell will literally break loose. I am sure Iran is aware of that possibility and that is why they want their deterrent.