He's 17, and came up with a plan to go to his younger sister's school to shoot and kill her, among many other students and faculty. Dr. Tim Rupp talks about the psychologists and other mental professionals who claim "this kid doesn't know that what he plans to do is wrong." WHAT? That isn't true of a 17 year old, or even a 12 year old. Although the brain is still developing, these kids know exactly what they're doing, and they know it's wrong.