It's real questionable if the target was ever Iran.
First of all, Iran's missile is not reliable nor accurate. Not exactly the type of delivery system you'd want to use if you were a state.
Second, the actual amount of damage that a few unreliable missiles could do pales against the conventional firepower that Israel could unleash much less us.
Third, despite the rantings of lunatics that Iran is run by crazy people, the recent election shows that the Mullahs are anything but crazy, but cold, calculating logical rulers. Why MAD doesn't apply has not been answered by anyone here.
Fourth, Iran will not use a missile when it has much cheaper, much more reliable and infinitely harder to stop means of delivery. The fact that we have not gotten nuked by someone shipping a nuke in a lead lined container ship is a damn good reason to believe in God.
Fifth, Russia offered to joint share a key radar station that would have been far superior to anything we had in Eastern Europe and guess who turned them down? Really, the defense is geared against Iran and not Russia, but we don't want to share a defense system with Russia? Huh.
Sixth, we all know that weapons programs get better as time goes on and as Congress pours untold billions into them. While it is in no shape to stop Russia (or even Iran really) at the current moment, it is a logical conclusion based on historical data to think that the system will eventually reach a point where it could potentially stop a Russian first or 2nd strike thereby making nukes actual, usable weapons for a change. Couple this with nuclear reductions and it's a distinct possibility. Same goes for the Chinese. And you'd be an absolute fool to think they don't know this.
If we were actually into protecting America, we'd be installing extremely powerful radiation detectors all over our borders and ports and actually inspecting cargo containers. Why bother spending
billions on a long range missile that may not even work when you can spend a few thousand to ship a lead lined container to America?
That and it will reinforce anti-American alliances.
THE STAR WARS FLOP | Foreign Affairs