Iran and Nuclear Capabilities

Why shouldn't Iran have nuclear power, nuclear weapons, nuclear anything? Are we the world police? Is the United nations the world police. What happened to freedom and independence? Could you imagine England and Europe denying the colonies to have weapons before the Revolutionary War? The more people say no to Iran and "you can't do that", the more they will want to progress their nuclear capabilities. Some fear Iran will use their nuclear weapons on Israel. Do smart people really believe this? The threats of Iran are right up there with the empty threats of the United Nations. Iran is like the the naughty child and the UN is the parent saying "I said not to do that". What if a nation with nuclear weapons goes "bad". Do we want their weapons? Did the Soviet Union ever use nuclear weapons on the United States? Right now Iran seems to be reacting a lot like Iraq before we invaded. How long before the bombing will begin?