I believe there are degrees of mental illness, some live in a fantasy world & from the outside appear normal. Such is their believe in what they are doing , & remember it is a proven fact this man was a trained soldier, no soldier worth his salt & all that survival training would run out into a crowded road in full view of security guards on the premise of a lucky shot. He would naturally choose a point of higher success in his mission as a soldier would, & correct me if I'm wrong did he not either before or after the killing also kill a policeman?