I'm hoping the the people who are really in charge of the US Military (ie the Generals) are advising the President that a pre-emptive strike would probably not be the best action in the circumstances.
I'm also hoping that they are advising that in the event of NK lobbing something in the general direction of Guam, then any retaliatory action should be proportionate.
Its a tad worrying when 'General Ripper' is the C in C rather than the 'mad general'.