Frankly I've not seen this.  What I have seen over and over is:

  (mostly Israel plus US):  We are going to bomb you.

  Iran:  Bring it.  You'll regret it.

  (mostly Israel plus US):  Mommy, Mommy!  Iran threatend us.

Feel free to document your assurtion that Iran said (or does) anything to the U.S. when not provoked.  I know they bolster Hezbollah, but to the extent that that organization is a 'terrorist' one, it's not a threat to us and especially not if we would quite poking our nose into other people's business.

As for us defending our 'strongest ally' in the Middle East, I'm waiting for an explaination of what makes Israel so.  Seems to me that as often as not they feed us bogus intel designed to give us cover to fight their percieved enemies.