Not every shooter is mentally ill. In fact, most mentally ill people are more likely to be victims of violence than the perpetrators. Most shooters are just shitheads, not mentally ill, and to constantly conflate the two is to add additional stigma to mental illness.
In addition, if this truly was a mental health problem, Congress could increase funding for mental health treatment by the end of the week, Trump could sign it by the middle of next week, and we could see an increase in people getting treatment by the end of next month. The fact that we're not seeing that leads me to believe that most know this isn't as much of a mental health problem as people think.
A very common factor in such mass murders is the use of antidepressants. Having seen up close what happens when someone on such medication misses a few doses (extreme & systematic rage), I'm stunned that there has not been intense investigation into the correlation.
People always mention mental illness, but other things are more common: being male; having a conviction for domestic assault; having a drug or alcohol addiction; having a TBI.
Other countries prescribe anti-depressant medication in similar quantities to the US, and those countries don't have the same problems of violence that the US does.
> having a conviction for domestic assault;
> having a drug or alcohol addiction;
> having a TBI
I know the YouTube incident, specifically, was not a mass-shooting incident (4+ casualties, not including the shooter) but the comment you replied to specifically mentioned mass-shooting.
That males are overrepresented seems fairly self-evident, but is there a noted link between DV, TBI, and addiction(s) with mass-shootings? I've never heard that angle.