It was concluded that the Sandy Hook shooter was a pedo that liked to shoot children.
The Colombine High School shooters were trying to kill the most people possible (but were shitty at making bombs).
The Colorado Theater (Batman) shooter said killing someone took their value and gave it to his life.
The Oklahoma City bomber said it was a counter attack against the Feds for Waco.
Dennis Nilsen killed 15 boys and slept next to their bodies because he felt lonely.
Son of Sam was a Satan follower listening to a demon that spoke to him through his neighbor's dog.
The Green River Killer murdered 48 women and girls, dumped them in the woods and then returned to f*ck the bodies. His motivation was to kill as many women as he could.
Not sure how knowing any of that stops the next one.