Quote from WallStWhizKid:
Iran has the ability to shut down 40% of the worlds oil supply that travels through the straits of hormuz.
If they ever attempted it they would be a border to border parking lot inside a week.
Second major problem, these nuclear reactor sites are buried hundreds of feet in the ground. The US doesn't even have the ability to take them out.
http://www.cbsnews.com/stories/2009/10/13/world/main5380905.shtml