I never knew the NCBI was a repository for spurious information & pseudo science. How foolish of me to think papers written by PHDs and researchers, actually had valid findings
The difference in the rate of violence amongst those who are mentally ill, compared to those who are sane, is marginal. 0.8% vs 2.9% respectively. So this is a pointless & irrelevant question. The more pertinent question to ask as it relates to this situation is why some people with serious mental illness are prone to aggression or violence while others are not? The answer to this question has to do with other underlying factors that are present in these individuals, like substance abuse, childhood trauma, and environmental conditions. I already said this numerous times in this thread. Furthermore, those underlying factors also drive violent episodes in individuals who are not mentally ill. When you remove underlying factors from the equation, the rates of violence between the mentally ill and the sane population ends up being more or less the same.
In the end what needs to be understood is that mass shootings account for less than 1% of firearm homicides and tend to be committed by individuals with issues besides diagnosable mental illnesses.