Killers - born or made?

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Across
  1. 2. Where the deadliest school shooting took place
  2. 4. Surname of the researcher who talks about brain damage in the video
  3. 6. One of the only games to be banned in the UK
  4. 7. Name of the serial killer in the video
  5. 8. When aggression is said to have a biological cause
  6. 9. Serial killers often lack this
  7. 10. When aggression is said to be learned
Down
  1. 1. The process whereby people get used to the effects of media violence
  2. 3. Area of the brain responsible for aggression
  3. 5. Type of scan that uses a radioactive tracer