Well, I beg to differ, create a forward presence of always on station Aegis equipped ships with the eventual upgraded SM missile that can take out ICBMs in the Sea of Japan off NK. next ask the Japanese with their eventual Aegis on-shore batteries to help if the trajectory is Hawaii, then base the same Aegis and SM equipped ships off of Hawaii, install new tracking and prosecuting radars in Hawaii, activate the on-shore Aegis and SM site at Barking Sands, then beef-up the GBI sites in Alaska and California with more missiles to protect Hawaii, so they can take multiple ripple shots at any in-bound missile or warheads.  If that is not enough to reduce the threat of leak-through to an impossibly low percentage, then rinse and repeat, by beefing up more of the same.  Spending a couple billion dollars to do this to protect just the irreplaceable military infrastructure of at least equal value, makes sense.  If we shoot down every attempt, Kim Jong Un will look impotent and stop.