Fighting back against Iran is difficult and costly. No American president from Carter to Obama has been willing to take it on.
For some years I have spent my time on exactly these questions - both in thinking about ways to prevent war, and in thinking about how to fight, survive, and terminate a war, should it occur.
In the building I live in on Park Avenue there are ten people who could buy the Yankees, but none of them could hit the ball out of Yankee Stadium.