Quite possibly, military veterans are routinely prescribed SSRIs for PTSD even though studies have shown they have no impact (Pfizer abandoned their study on Zoloft when the results showed the drug didnāt help). There is strong correlation between both SSRI use and SSRI withdrawal and mass shootings, especially in school shootings. Itās as good a link to causation as we have, given that mass school shootings are a fairly recent phenomenon and guns, which normally are blamed, have been around for a long time.
Some lad walked up to John Lennon on this day many years ago and shot him. But the random shooting of innocent people is definitely a new phenomenon alright.
I would say the primary correlation, whether itās Mark Chapman or most others, is complete self loathing and hatred of life. Itās basically suicide where they want to bring others with them and make a name for themselves.