Having been associated with the mental health medical community for about seven years, let me tell you, I learned that mental health care is not for amateurs and is very tricky business. And I thought I read that this fellow was on medication for depression and anxiety. People on these meds need frequent clinic visits and need to be very closely watched.
The problem is that depressed patients often clearly must be treated, but the treatments themselves can sometimes paradoxically make things worse. The most commonly used class of antidepressants, SSRIs, can basically dull the emotional and moral spectrum of patients. That is, the patient may be inured to symptoms of hopelessness and despair, but the meds may also may cause the patient just to not care about anything or anyone else. In other words, the meds can result in them ending up on the tipping point of sociopathic behavior. It will be interesting to see the reports of what this man’s demeanor was when he did this.
The watch time on anti-depressants is when the depressed person starts feeling more active - that’s when they often kill themselves. Once they get past that, the drugs can work wonders. I don’t think they depress “morals.” They do relieve relentless, pointless guilt associated with obsessive compulsiveness but do not turn people into moral idiots. Unless they were like that originally.