If Iran was flying weapons in, that would be easily detected, even without NSA.
Continued airport bombings (especially of the fuel supply) is simply making it impossible for people who want to leave to actually do it. Same with the naval blockade, since the only alternative to the airport is ferry to cyprus or highway to the border (also being bombed).
Its akin to trying to shoot between the eyes with rifle birdshot. You may actually hit your target...but the collateral damage caused is much more extensive. Simply not the best way to get what you want. In my opinion, these tactics are specifically designed to ensure that US and other countries engage...and the PR effort is designed for them to engage on the side of Israel.