Ok, I realize this isn't a strictly scientific journal, but the premiss is at least plausible.
After all we're breaking our butts to figure out why a few nut cases are causing us so much grief.
http://www.motherjones.com/environme...-link-gasoline
Granted this is not about school shootings. It's about violent crime in general, but that's part of the anti-2A argument, that guns cause crime. Maybe it isn't guns.
MB