Just for the record I would like to state that I am guilty. When I was in the third and fourth grade, my best friend and I used to draw all sorts of violent, sexist, disturbing stick figure drawings and the teachers never even blinked (click to enlarge).
I still have
The evidence is right here. Come and arrest me you chicken-shit motherfuckers.
I won't mention all the stuff we set on fire and blew up.
In related news, I just finished reading Columbine by Dave Cullen. It's an excellent retelling of exactly what happened with plenty of cogent psychological analysis. Forget all the myths you've heard, this is the real deal. Except in the minds of the negative reviewers.