You Can't Kill 'Em if They're Already Dead

Dreams of vengeance, justice, karma? Obsession with getting even, balancing the scales, teaching them a lesson? Refusing to accept being erased, forgotten, annihilated, deleted? Plotting and planning revenge fantasies and driven by rage?  But what if they are already dead? Takes the wind right out of your sails, doesn't it? How can you harm someone who is already the poster child for abuse? Someone so mentally delusional and sick? It's a tough situation. What do you do?