Such a clear cut case of a determined person making a stupid decision based on some retarded belief or principle, and then doing it. The environmet itself was like some journalist mode video game mission that anyone with half a brain could complete. You can argue maybe there is some mossad mind controller drug affecting his mind that's about the most reasonable twist you can put on it without getting insta refuted by the evidence. However I have not heard a believable explanation on the old guy and the guy with the pellet gun. Maybe you can find such people in every event like this.