Maybe if he had some drug in his system he would have not gone nuts.
Was thinking the very same thing. The problem is that he didn't have any drugs in his system! If he'd been taking his anti-psychotics, anti-depressants, and ADHD medication, maybe he'd been a drooling mass of humanity instead of a stone cold killer.
You may not be off the mark. When we tried to get out autistic son off Prozac twice, both time he became suicidal and increasingly violent. We gave up in the end and he is still on it but doing better overall with the help of still other drugs.