Anxieties are mounting as nuclear weapons make their way into unstable regions. In a SPIEGEL ONLINE interview, US disarmament expert Richard Burt discusses the growing risk of their use, why allowing Iran to get the bomb could trigger a Sunni-Shiite arms race and how an attack could make citizens demand a police state. [...] The problem with Iran is not that there is necessarily going to be an Israeli-Iranian nuclear conflict. In fact, I think the Israelis would probably deter the Iranians from using nuclear weapons. But the danger is that once Iran acquires these weapons, there's the potential for...