I do not agree with Mattis - I think we SHOULD have shot down any/all attempts by NK to launch their missles.  We are NOT dealing with a rational person here.  I don't think NK would have responded by shelling Seoul - that would have insured NK total destruction - something "Fat Boy" does not want.  Even if shooting down NK missles appears as an act of war - we need to demonstrate that we have the superior capability AND will use it.