I definitely believe that SSRIs are another contributor to this phenomenon. I was on that shit for a couple years, and once the meds start taking effect you just stop giving a fuck about anything. I guess the idea is that you stop caring about whatever was making you wanna blow your brains out, but the pharmacologically-induced apathy is indiscriminate and wholly encompassing. I definitely could see some kid fucked up that shit before his brain has even finished wiring itself going out and shooting up a school.