These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Unfortunate Implications: The film seems to be unable to decide if it conveys that revenge is right or wrong or if forgiveness for wrongdoing is possible. Driver is a Karma Houdini despite going back and killing someone in the middle of surgery, talking to the victim's dead son, and murdering a handful of other people, but Cop, who seemed to be trying to get his life in order, gets the shaft in the end. Why did Driver decide the Preacher was forgivable but Cop was not? He had no idea Cop was trying to get his life right so it makes the entire situation seem arbitrary.
Except in Cop's case getting his life in order meant wrapping up loose ends, like killing the man who wouldn't die ten years ago. Also it's a virtual trope of itself in revenge fics (those that take place years after the original crime) that the avenger will encounter at least one target (usually with a young child) who regrets what happened and is trying to live a decent life, yet gets killed anyway.