The all too obvious answer to #13 is here: They are shooting each other with the guns they love so much or guns they fear so much but cannot stop buying anyway in the stupid and wholly futile hope that more killing tools out there for either some or everyone provide more security for anyone.
This, ladies and gentlemen, is historical blindness wrought large. For it is with guns that white invaders proceeded to massacre the native human inhabitants of North America. And it is guns on which they have built their myths. This is what they now pay for with their lives, the yin to the yang, not one bit more enlightened than the original violence and conquest from which the myths sprang, and not one bit more selective in who lives and who dies. The sinners and the ancestors and descendants of sinners alike are now caught in a wheel of profit and fear that keeps grinding them to bits.