Is forgiveness a waste of time?
Say a bad guy kill's your dad for the $30 bucks in his wallet. And this guy has done bad stuff for years. Comes the trial and you get to make a victim's impact statement. You suck it up and do the Christian thing and say "I forgive him". He gets life without parole.
Then he dies and God puts him in Hell and torments him beyond anything you could ever do yourself. God does medieval stuff to him and it goes on forever. So if you know he's going to get what he deserves and a lot more, how can your forgiveness be sincere? When you forgive somebody, there's no payback after that. Aren't you faking it and lying to yourself? Maybe even looking forward to what he's got coming?