Agreed. When I saw that photo from the helicopter, I wondered why nobody was shooting at him.
What creeps me out is that he was crafty and lucid enough to plot this out, down the the drugs he took and the music he’d listen to, but there was no empathy to go along with the motivation and intellect.
That’s about as close to defining pure evil as I can get.
Just like the bombing of Dresden, I think. ("Oh, THAT'S different", angrily shouts the apologist choir!)