Re: Revenge and justice are very closely related. You'll learn that as you get older.
I'm somewhat reminded of Albert Pierrepoint, the UK's last hangman and a very prolific one, commenting that he didn't think the results of his job served as any sort of deterrent. I'm not sure how political a point he was making, he seemed very proud of the professionalism with which he went about his duty after all, but just that it didn't really accomplish the goal its proponents tend to highlight. I'm also mindful of other court judgements that seem to be Making A Point: which they do, but they're often insufficiently clear about which point they're making, with the resulting risk that onlookers may simply conclude that some of the people presiding over their deliberations are loose cannons with insufficient accountability.