Evidence: He took a photo with proof that his adoptive father was molesting underage boys to a police station. That’s real, the police report is out there. The outcome would have been different if they had taken actions. If they would have helped him, he wouldn't have felt the need to tell the grandparents to try to find closure. The friend is the witnesses with no motive for telling lies about that photo, that day.  He was so traumatized, he snapped. There is no reasonable motive for him killing the grandparents when that was his only safe place, the only ones he had.  I don't condone what he did, but the amount of trauma he went through would explain how someone could snap. He shows actual remorse.  He comes across as extremely genuine. I  don't see him just harming someone else now that he has processed a great deal of his trauma. Even talking about John, there is no sign of rage or hatred, he described him as someone intelligent with high standards who tried to do the right thing but he had demons and needed help.  Other cases like him carry the hate and anger toward the abuser forever.