" Eric penned nearly a dozen new journal entries in the next two months.
"I have a goal to destroy as much as possible," he wrote, "so I must not be sidetracked by my feelings of sympathy, mercy, or any of that."
It was a mark of Eric's ruthlessness that he comprehended the pain and consciously fought the urge to spare it. "I will force myself to believe that everyone is just another monster from Doom," [the computer game he played day and night] he wrote. "I have to turn off my feelings. "

― Dave Cullen , Columbine