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.