I'm older, most of you folks don't remember this, but we used to have insane asylums and people were committed, either by their family or doctors when they weren't fit for living in society. In the 70's or so the liberals started closing these places, claiming it was inhuman to lock people away.
These weren't really bad places, just a place for people to live and keep them medicated and in check. We had a distant family member who was in one. These days though they just medicate people and let them live among the rest of us.
Not sure what the shooters issues were, if he had any, but with all these recent events - it makes guys like me think what might be different if people were locked up like they used to be.