No ------
The obsession of the American foreign policy community, as well as most American (and a good many international) politicians, by the myth of Iran's "existential" threat to Israel, brings the world steadily closer to another war in the Middle East.

The debate over Iran takes for granted that the country soon will have nuclear weapons and would use them. The debate back in 2002-'03 over Saddam Hussein's alleged possession of nuclear weapons did the same. After the United States had gone to war against Iraq, no such weapons were found to exist.

The actual winner of the war that followed the American invasion of Iraq was Israel, which saw Iraq, its principal regional rival, destroyed at no cost to itself. The military victor of the war, but politico-strategic loser, was the United States, which destroyed Iraq, a country in no position to harm the United States, at a trillion-dollar cost, enormous human suffering and waste, and the effective transfer of Iraq to Iran's zone ...more

Source: google

No

Actually speaking any country with Nuclear weapons need to be feared. But countries like Iran and other countries which have strong orientation or fanaticism or obsession towards religion, communism, or any other things pose greater threat to the peace of the world. The countries' politics which are ruled by the emotion and sentiments will always pose threat to the neighbours. If today, Iran is behaving as a sane and responsible country, but any moment it would lose its sanity if any untoward incident happens. So it is better to have a non Nuclear Iran country in the world.

Source: own thoughts