why can't other nations have nukes? (paraphrased)

Like ynot said, nukes will probably keep the peace. But do you really want to let a nation like Iraq get nukes? That would be like giving a known felon a sawed off shotgun. Saddam has expressed his hatred for America before, and I wouldn't be surprised that if and when he had nukes he'd pass one off to a terrorist group. Superpowers have a lot to lose by inciting a nuclear war - 3rd world countries and terrorist organizations don't.