I guess the humane thing to do is wait until that stray missle that could have been shot down by the limited anti-missile system actually hits some city, and starts a global thermonuclear war. THEN we can use the old-fashioned, time honored policy of Mutually Assured Destruction to kill off any survivors in the rest of the world. THAT should satisfy you.
Heaven forbid we should intercept missiles and keep them from killing anyone.