People are just fear mongering to suggest Iran would use them or give them to those who would. The real issue here is that once you have them, you basically entrench yourself as a regional power. If the regime started falling out of favor, all their neighbors would be obliged to come to their aid to protect the nukes. Also, you would be far more limited in how you fight your proxy war. These are the things the involved parties are considering, not Armageddon fantasies.