“Everyone should recognize that Kelly Thomas, Jared Loughner, James Holmes, and Adam Lanza ....”
Everyone should recognize that lumping Kelly Thomas in with those killers is going to completely bias readers against whatever point you were trying to make.
Prior to the murders committed by Lanza, Loughner and Holmes Thomas was more clearly dangerously insane than the others and had committed violent acts.
My opinion applies to all the mentally ill that present a danger to themselves or others. They should be institutionalized.