I find it really interesting that you are defending against a claim that was never made in the article - the possibility of him being "demonic". Personally I found it strange that the piece speculated so much from a psychological angle but didn't remotely mention the spiritual, while my thoughts on reading were exactly that - perhaps the person or place was under some kind of demonic possession and this is the outcome of a spiritual attack. A little instance of the world we don't understand spilling over into the one we do.
"The greatest trick the Devil ever pulled was convincing the world he didn’t exist." - Keyser Söze, after Baudelaire