It's like after Columbine where every Goth kid was all of a sudden a suspect.
We don't know the story around this kid, this family. "Mom" was apparently a survivalist who collected high powered guns and liked to go out drinking and talking about them. I don't know how many survivalist gun nuts you know, but usually that comes with a particular worldview. Paranoia, Alex Jones.. shit, you even see it on DU, the armchair commandos who "Need" their AR-15s to "protect them from teh gurvnurmunt" 
This kid certainly seems to have had some issues, and being in a single parent house where the only other person was a presumably paranoid anti-government survivalist who had lots of big guns, couldn't have helped.
But the bottom line, to my mind, are a few things; One, the easy access to rapid-fire weapons, and two, this crazy paranoid streak in some corners of the American population. That we don't do enough for kids with emotional or mental issues, too, is part of it, to be sure.
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