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The father of the 18-year-old who killed 19 children and two adults at a Texas elementary school says he has no idea why his son became so violent. His son carried out the massacre Tuesday before being shot and killed by law enforcement. In an interview Thursday with The Daily Beast, the father said his son should have just killed him instead of doing something like that. He blamed the teen's mother for not buying him new clothes, claiming he was bullied at school because of it. He said he's speaking out because he wants his son's story out there and said in the end, he lost a child too and that hurts.