I appreciate the recommendation and I will read it (I also appreciate that you made a recommendation instead of downvoting me), however I don't think free will has much to do with this. If they were predetermined to be like this then I have sympathy for the bad dice roll, but once they've stomped an infant to death they're always that person. It doesn't change much about how to deal with them; you can't trust that they won't do it again no matter how much time passes, and that means that saying sorry and making Pascal's wager come off as completely hollow.