"The links between antidepressants and violence are well documented
A study published in the Public Library of Science
Medicine (an open source medical journal) explored these same links in detail. (See Antidepressants and Violence: Problems at the Interface of Medicine and Law, by David Healy, Andrew Herxheimer, David B. Menkes)
The authors note that "Some regulators, such as the Canadian regulators, have also referred to risks of treatment-induced activation leading to both self-harm and harm to others" and the "United States labels for all antidepressants as of August 2004 note that 'anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania, and mania have been reported in adult and pediatric patients being treated with antidepressants for major depressive disorder as well as for other indications, both psychiatric and nonpsychiatric'".
In other words, the link between antidepressants and violence has been known for years by the very people manufacturing, marketing or prescribing the drugs. As the author of the study mentioned above concluded, "The new issues highlighted by these cases need urgent examination jointly by jurists and psychiatrists in all countries where antidepressants are widely used."
That was last year, well before this latest shooting. The warning signs were there, and they've been visible for a long time. Medical authorities can hardly say they are "shocked" by this violent behavior. After all, the same pattern of violence among antidepressant takers has been observed, documented and published in numerous previous cases."