Complex problems have numerous causes and no single solution would fix such problems even if I believed a solution exists.
Violence and murder have existed as long as people have walked the Earth.
While I would like people to seek help for their mental health issues, in the Land of the Free, it seems to be illegal to compel all those who are mentally ill to accept treatment. Talk to a few homeless people and see how long it takes you to talk them into accepting mental health treatment. In fact, the murderer's mother was in the process of committing her son to a treatment facility. His reaction was not totally foreign to many of us who have dealt with Emotionally Disturbed Persons.
Be safe.