Hi Larry!  You and I have usually stood on opposite sides in these debates, and while I generally disagree with your tone, (and you probably do with mine) I think a conversation about the psychology of a mass shooter is probably a good one to have, as members of a society where this is becoming more frequent.  

Mass shooters seem like crazies to me, and/or suicidal, using a gun or guns to carry out their plans of killing/being killed.  There's no argument that these incidents are becoming more frequent, and your example of navy ships makes me think of the evolution of war throughout history---How we as a society have "progressed"  toward a state of total war, involving everyone.

Terrorism  aside, this "war" now continues inside the minds of a disturbed few in the form of these mass shootings.  Is the answer really to arm everyone?  Or to make guns less available?  To live in a police-state with a cop on every corner?  Or something we haven't thought of?