Downside is that his motive is a secret that he took with him.
He was supposed to off himself. He was not supposed to live and be able to tell his story. The Feds have a shit pot full of those just like him. All they have to do is wind them up and point them in the direction they want them to go. When they do their deeds, they either off themselves or the Police kill them. Dead men tell no tales. And the sheep eat up the cover stories the Feds feed to the media. Just as they did the Covid 19 bullshit.
Motive?
Why does that matter?
Seriously? Even if he left a note (or manuscript).
Do you think anyone will say, “Oh! Now we understand. And I would have done all that shooting too.”?