Is it always the weird emo loner quiet kid that do all the horrible shooting at school?

On my way to work I was listening to the morning radio news from what I hear this 18 year old never went out he was always locked inside his room and now his grandma is at the hospital. What an evil demonic kid he try to murder his grandmother the one who provide him food a roof. I love my grandma I can't imagine. Sounds like this 18 year old had anger issues and needed to see a therapist.
Is it always the weird emo loner quiet kid that do all the horrible shooting at school?
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