Testoterone has always been present yet these incidents have not. Especially for us older folks, we've grown up surrounded by guns yet these kinds
of things didn't happen. So the link is somewhere else. If you read papers written by social psychologists that specialize in this sort of thing
you'll find that the common denominator is social isolation. The huge increase in bullying is directly related. The kids involved in these acts
have been aggressively and systematically ostrasized by their peers.
Most all of us were bullied 'back in the day'. But it was different. It usuallyinvolved a relatively small group of protagonists (usually one or
two) and a small group of witneses. There was always escape. But with the pervasiveness of social media, bullying and the accomanying harassment
will quickly spread to the entire school and beyond. The harassment is inescapable, non-stop and will involve a huge number of people. Kids with
underlying mental health issues are convenient targets becasue of their unusual behaviors, social awkwardness and preexisting emotional frailty.
Many choose suicide. Males are 5 to 6 times more likely to commit suicide than females. Overall the rate is about 10 kids per 100,000. The rate of
homicidal acts for this age group peaked in the mid 90's and has tapered-off to pre 1995 levels. The rate is between 10 and 25 per 100,000 with the
18-24 age group having the highest rate. Keep in mind that gang related acts account for 68% of these and are included in these numbers. So, if you
back-out gang related homicides the rate of suicides and homicides is about equal for this age cohort.
So rather than testosterone or guns, both of which have been present all along, it seems that some cultural/societal shift over the last couple of
decades is what is behind this.