The USA may be trying to bait Iran into doing something that would justify war. After all of the officially confirmed, and widely believed, false flags of the past few decades (the gulf of Tonkin perhaps being the most significant for a couple of reasons) I doubt that they want to pull another one, that would be later uncovered, for their justification in invading/bombing Iran. So, obviously, the second best option is baiting Iran into actually doing something that justifies attacking it.
I may be way off, but it's possible.
I may be way off, but it's possible.