A whole week...?
I think we'd want to find out who built the weapon before we retaliated.
I’d like to think you were right, but personally, what I see after a nuclear attack is lots of handwringing, obviously lots of taking care of the millions of injured, rebuilding the destroyed areas - and absolutely no military action, except perhaps in our own country. Of course, if Osama Obama’s in charge, he’ll be down having an extra large key to the (former) city of DC being made for his Muslim/Marxist homies.