My first question was the same as yours. How old was he when it happened?

It's a toughy alright..

If this child in a man's body had ever displayed extremely violent tendencies at home, then surely the family would have taken steps to protect him from himself and others..

However - if the people closest to him had only ever experienced harmless tantrums, then how could they know that he may see outsiders as non-people?

Interesting. Thanks, Beth.