I think they mean to forgive him in an emotional sense and not a physical/social/judiciary sense. Or that the forgiveness is of the "spirit relm" where they toss all their cares and concerns, you know, up to the sky with God so they don't actually have to think about shit.
If someone hits my car and apologizes but the damages are high, I might forgive them for their mistake at that moment once we have talked things out but I would still expect them or their insurance to pay for my car. Does this mean I haven't forgiven their action? hmm
To forgive can mean to stop feeling angry OR it can mean to cancel a debt. It's not always both meanings simultaneously.