Shame for the state of humanity comes to mind.
He was religiously radicalized, and taught by many different people that you can “help” people even as you cause your own or other’s deaths.
He wasn’t on a suicide mission, but he was absolutely okay if other people died, or if he died. He was completely comfortable and supportive of the idea of being a martyr, (even if he might not have thought of choosing it first). He shares some of the responsibility for ignoring the easily learned lessons of the genocidal history he knew. Other people share responsibility for teaching him that religion was served by risking people’s lives avoidably.
Religion isn’t “I’ll go to a crowded place and throw a knife in the air and God will tell me who He wants to live.” That, in essence, was what he was doing.
He then rationalised his actions the same as any other religious fundamentalist that causes unnecessary human loss, looks like. It’s a waste of human potential, but it’s still a tragedy caused by fatally mistaken people.
