Yeah, Scientologists have always been critical of drugs like Ritalin - and sugar, too.
I don’t think he’s right here, but lenient gun laws aren’t to blame, either. The shooter(s) are to blame.
Check the link in comment# 1. At first, I thought it was baloney too. Selective Serotonin Re-uptake Inhibitors, SSRIs, the drugs that a great many of the shooters in the school shootings were taking, are associated with serotonin syndrome, in which patients can become manic and violent among other symptoms, and serotonin withdrawal/discontinuation syndrome. The FDA said the drugs had to have black box warnings on them last year because later examination found an increase in suicidal ideation when the drugs have been started or the dose increased. The patients need closer monitoring in either of those situations for about 6 weeks.