I am no lover of I'm a Dinner Jacket and his odious colleagues, but I do support the points that Widger makes. If I was Iranian, I'd want nuclear weapons bceasue of all my dodgy neighbours.
Iran gets Nucs, their neighbours will as well.
Turkey, Egypt,
Saudi,
UAE etc etc are all starting "peaceful" nuclear programmes.
Once every one in the region has them, how long do you think it will be before someone uses one themselves or sells/provides one to someone else?