Maybe it has dawned on Trump that the presidency of America is not a reality TV show and he doesn't get to write the script.
The law of unintended consequences could apply if the Iranians don't back down.
All those who would like to see the Iran get smashed up should think of their own self interest, a war could send the price of oil up causing all sorts of problems for the west.
Iran is way bigger than Syria and Iraq, a war could see millions of refugees looking for somewhere to go, Saudia Arabia will close its borders as will Israel and America ,Turkey won't want them so the only place to go will be Europe ,just like last time.