Many of Iran's neighbors are not as worried about Iranian nukes as they are concerned about a more aggressive Iran attempting to seize bits of disputed terrain throughout the region (as it has already been doing with small islands in the Persian Gulf), and asserting its traditional role as the regional superpower. Iran already has weapons of mass destruction (chemical weapons developed during the 1980s war with Iraq), but has never put them in play. Iran has never let terrorist groups have any of their chemical weapons, nor has it openly threatened to use this stuff against its neighbors. This is consistent with past behavior of Iranian leaders, who are not known for rashness. Iranian extremists, especially the Islamic militants, are another matter. They are kept under control, just barely. They are the wildcard that makes everyone, including many Iranians, nervous.