The issue is ADHD meds given to children and the inevitable discontinuance. They are playing with definitions to exclude the causal medicines to absolve themselves of responsibility. Yes we have way more guns than most everywhere. But I believe use of ADHD & SSRIs within a society is correlated with violence, especially when they are discontinued. The high level of violence on TV and in the cinema are a slight factor. It seems video games only train those prone so while they influence by training and conditioning, healthy kids can separate that from real life. Papers looking for recent use show low corelation. But research into the prevelance of SSRIs in a society compared w gun availability would need to be done. It's hard to sort out are we a sick society or are our meds making the volunerable more at risk. Suicidal ideation is a side effect of SSRIs so is the propensity to kill while going out an effect? The link w recent ADHD meds is low for a small sample of 48 school shootings. I'm still suspicious while I do feel the lack of regulation of our personal arms dealers is the biggest factor.