They will retaliate if attacked. Imagine that.
This is posturing to a certain extent, but regardless they've "behaved" for over 20 years, and have become more progressive year after year for the last 15. Leave the Iranians alone, why stir up an anthill?
That said, I think Bush will allow an attack if he thinks he can get away with it. I don't think it's him for the most part, it's the DoD\ex-pentagon loonies in (and behind) his administration.
Not demeaning him at all, but everyone gives Bush a lot more credit than he's due. His direct powers are very limited.
NEVER kick a man in the balls.
Straying a bit, but if someone attacks me I'm going to do my best to take them out as quickly as I can. Gnards are fair game IMO, though not the first thing I'd aim for. A baseball bat to the knees or shooting someone too for that matter. Of course, I haven't been anywhere near getting in a fight in years. Or even in a situation where it might arise, other than the possibility of random loons.