With three movies to compare between, I really appreciate how each Knives Out movie explores justice from a different thematic angle, not based on the murder that was committed but based on the cruelty that led to that murder.
In Knives Out, a compassionate, ethical young woman treats everyone around her with generosity, and the people around her repeatedly try to take advantage of her kindness to force her into losing the fortune that was gifted to her by a dear friend. There, justice means that she keeps the fortune and decides that actually, she doesn't have to be kind and giving to people who've proven themselves assholes.
In Glass Onion, a woman loses her sister to a gang of wealthy, successful people who've sacrificed their principles for the sake of ambition and ego. There, justice means that everyone involved will be made notorious: whatever their other accomplishments, they will forever be known for being complicit in the burning of the most famous painting in history.
In Wake Up Dead Man, the church takes advantage of a young girl's loyalty and faith to place her under a lifelong burden and fill her with guilt, shame, and hatred. Justice means helping her understand what was done to her and the women around her, and giving her compassion so she can find peace.
This is cool because it means the movies contradict each other! The compassionate justice of Wake Up Dead Man would be totally misplaced in Knives Out, and so would the toppling-monuments justice of Glass Onion. And because each movie has something different to say, they all stand on their own and feel fresh.
This is also why Benoit Blanc is the uniting figure but never the protagonist of these movies. He's an agent of legal justice in that he's the detective and it's his job to figure out whodunnit, but the protagonist -- Marta, Helen, and now Jud -- is always the character who delivers thematic justice.
