It's a loaded question because you first have to conclude that Iran wants a nuclear weapon and has a program to build one. The IAEA has stated there is no proof that Iran is developing a weapon. Even the US has stated that Iran used to have a weapons program, but decided to stop it. However, if you listen to the American media you probably believe they are developing one to kill millions of people in Israel. Conclude what you will about the allegiances of the American media. The propaganda machine wins every time unfortunately.
The facts speak for themselves though, and here's another fact: the US House of Representatives once published a report about the Iranian nuclear program that the UN called "erroneous and misleading" for its incrimination of Iran, so make of that what you will. I wrote a hub called "The Iranian Nuclear Program", which links to this report and gives all the information on the issue.