No doubt they are sick individuals, but everyone feels like killing another human being at one point. It's a part of life, and I myself am fascinated with serial killers. My favorite would be Jeffery Dahmer, you guys?
I think if they kill over 3 people and it was on purpose(mental breakdown not included) should be killed and if it was possible the same way they killed
Eric Haris and Dylan Klebold - The Columbine Killers.
As a member of "columbinegame" and a player of the game "Super Columbine Massacre RPG" (look it up) I know a great deal about the Columbine killing. The casualty total, the things that provoked the killig... the boys were bullied so much. They were outsiders. They were angry. They put things in perspective.
Snowball, actually I saw a documentary on the Columbine boys. They were actually popular and very active at school. It is believed that their psychosis stemmed from much earlier events. It was a great show on Nat Geo