@farmerman,
That's a good idea. Tax them if you can't teach them.
I think the NRA is part of the problem and it needs to go. One way or the other. My call for murder is admitedly histrionic and unresponsible but hey, I ecourage an all out assault, through as many means as possible such as shunning them, shaming them, defunding congress members who receive their money. Draw them to court. Tax them. Vote them out. Extoll a price as high as possible on this antisocial organisation called the NRA and all its donors and affiliates. They are your kids' real murderers. I'm serious.
Take them out by any means necessary (and err.. okay, legal). Yesterday.
Otherwise with millions of guns and megatons of ammo out there, with a vibrant gun addiction in your culture, with the growth in numbers of the post-truth neo-liars in Trump's wake, with the perverse nature of social media... the copy-cat potential of these things will grow regularly until it's your own kids, your own grand kids, your own nephews and nieces, who will die.
Kids' safety and protection is an existential necessity for any group. Adults protect their kids; that what us mammals do. Baboons know that, instinctively.