I don't think JP wants to put the old man in prison, or torture him. He is only saying, or at least I am saying, he is responsible for his decision, for his life, and ultimately for the misery of his own children whom he indoctrinated. Let that serve as a lesson to those who are not JW's. And yes, treat the old man with compassion.
We have to stop the "justification game" at some point. We can go back to the beginning of time and end up with "It's the fault of the creator", or bacteria (suit your belief)