Sounds like “blaze of glory” time. It’d be interesting to see a timeline of his personal life for the past 6 months, together with his internet history over that same time.
Yes I was wondering about who he listened to or what groups he may have been involved in or what if any drugs he may have been taking. Seems odd that a guy who was described as nice and quiet just goes off like that.
If I didn’t know better I would think someone has been in his head telling him to do it. It reminds me of the movie
“The Kiling Room”