Put yourself in his shoes. Would you keep quiet if someone had made an untruthful film about your deceased child?
I don't share his opinion, but I think we should try to see things from his perspective.
I'm in the camp that believes that it's not always what you say but how you say it. Then when people meet him where he's at, he blocks them. He cannot connect the dots from abandoning Amy as a child and the lifelong, negative consequences that many people carry from that. "Oh, I though she was over it when she was 9." Yeah, she was over it, just a coincidence that she was put on antidepressants when she was 13, was it? He needs a really good therapist. That's not a swipe at him, it's a simple fact.
If he doesn't deal with this then I guess he doesn't need rehab either. We all have blind spots. Repetitive negative behavior that we sometimes don't realize. We get conflicted. We automatically do the wrong thing over and over without knowing why our life is so difficult or why we're so angry. We need a professional. If he would do intense CBT, he could get a lot of this trivia out of his system and stop broadcasting it to planet.
He'll never find peace like this and he needs that so much more than he needs revenge. The definition of insanity? Doing the same thing over and over and expecting different results.
He said at some point Amy had to be responsible for herself, very true. So, who is responsible for Mitch, Mitch?