So when an endless string of American, Israeli and Saudi politicians/despots call for Iran to be bombed (including with nukes), Iran should better believe them.
That's the reason why any country would be a fool not to go for nukes when threatened by the US. Deterrence is the only thing that works. Give your WMD's away and the US will attack you, as history has proven repeatedly.
Iran isn't the world's greatest sponsor of terrorism, the US is. By a huge margin that is bigger than the relative spending on military.
You feel threatened by Iran spreading some "Islamist revolution" world wide even though you wouldn't even be able to provide a single example for that. The US has been supporting and facilitating the rise of Wahhabi & Salafi Islamism worldwide since the Eisenhower days (1950s) at the latest. It is still supporting radical islamist groups in e.g. Syria, whereas Iran supports a secular government.
Not to mention the fact that the difference between Irani Shiite Islam and Wahhabi/Salafi Islamism is about as huge as that between Quakers and Westboro Baptist church.
You hands down prefer fantasy to reality, don't you?