Iran is a midsize country of some 70 million, with a per capita income of only about $2,000 a year. It has no weapons of mass destruction, and its conventional military forms no threat to the United States. From an Iranian point of view, the Americans are simply being unreasonably aggressive. Supreme Jurisprudent Ali Khamenei has given a fatwa or formal religious ruling against nuclear weapons, and President Ahmadinejad at his inauguration denounced such arms and committed Iran to remaining a nonnuclear-weapons state.
Tehran denies having military labs aiming for a bomb, and in November of 2003 the IAEA formally announced that it could find no proof of such a weapons program. The U.S. reaction was a blustery incredulity, which is not actually an argument or proof in its own right, however good U.S. Ambassador to the United Nations John Bolton is at bunching his eyebrows and glaring.