Ding Ding Ding! We have a winner. His acts of violence were counter productive to his cause. They were for his own gratification. He was a serial killer that thought he had the blessing of Allah.
Will Michael Moore make a movie about him?
His acts of escalating violence as a youth graduating to vicious murder later and his failure to stand out, combined with his seeking out of the most dangerous situations ("possessing no fear") are the hallmarks of a psychopath.
They don't experience fear or any highs or lows the way we do and the only way he could even come close was to murder people in a variety of savage ways.