What is the difference between dropping tens of thousands of conventional warheads vs dropping a few nukes?
The atom bomb is a paper tiger which the U.S. reactionaries use to scare people. It looks terrible, but in fact it isn't. Of course, the atom bomb is a weapon of mass slaughter, but the outcome of a war is decided by the people, not by one or two new types of weapon.
-Mao
A nuke or even ten cannot win the war. The missile launchers and depots are all over Iran and most of them are made to withstand penetration bombs and nukes don't do penetration. All nukes would do is convince the world to destroy america before america destroys the world.