Evil causes mass murder. Nearly all the demons (people) who commit mass murder are evil. Whether or not they have a mental illness is of little relevance.
For example, these descriptions/statements have little relevance: The Connecticut mass murderer (Adam) is described as "shy, smart, and socially inept". An interviewee said, "I think he might have had some social disorder or something".
This is not the first time a killers social ineptitude has been emphasized. They always do this. This bothers me because it unfairly stigmatizes mentally ill people and/or loners.
In truth, 99.9999999% of socially inept and even mentally ill people do NOT murder or even have a desire to murder other human beings.
Mental illness does NOT kill, evil kills. These mass murderers are evil. The largest mass murderers in history are typically social apt NOT inept. For example, Hitler and other nefarious leaders have great social skills.
Even shooting spree murderers are often considered sane AND socially apt. Anders Behring Breivik murdered 77 innocent people (mostly children), but was declared sane.
My point is that mental illness has nothing to do with being evil. These are two completely separable psychological description. In general, mentally ill people are just as safe and benevolent as non-mentally ill people.
Here's a quote that, perhaps, conveys what I'm trying to say better than I can say it.
"Men kill, men steal, men torture, men concoct evil plots — men run concentration camps — and, at the same time, seem perfectly "normal," "ordinary." They are logical, lucid, functional, and, in the case of certain Nazis, also love music, their families, their pets. Men — women too, but in different ways — who commit cruel and evil deeds are nevertheless [sane] members of the human race [...].
Breivik got up every day, washed, ate, got dressed, and "went to work." For years, he worked as an equity trader, as the director of a software company [a job that requires social skills], and as a farmer. His real "work" consisted of planning this massacre. He saved money. He read books and articles. He wrote a (partly plagiarized) manifesto that is rather well written.
[...] Breivik was not a loner. He got out. He socialized [...]. Breivik knew and probably still knows right from wrong. He knew that he was making a political statement, a horrendously bloody political statement, one that in his view was meant to save Norway from destruction at the hands of barbarian invaders — an act that was perhaps meant to teach appeasement-minded Norwegian leaders that violence now awaits them on either side.
As a former forensic psychologist and as someone who has been consulted by lawyers over the years many times, in my expert opinion (one rendered from afar), Breivik is more than sane enough to stand trial. He is also a violent, evil, sociopathic man. Men who rape their children, men who beat their wives, rapists in general, tend to pass most mental health tests and are spookily indistinguishable from the rest of the population."
I'm not saying that all mentally ill people are safe. All I'm saying is that mentally ill people are just as likely to be evil as non-mentally ill people. Just as 99.999% of normal people don't have a desire to commit mass murder of innocent people, 99.999% of mentally ill and/or socially inept people don't have a desire to commit mass murder of innocent people. Their is absolutely no reason why social ineptitude should be emphasized when describing or trying to understand evil people.