The backlash is a joke
I'm struck by the angry backlash to the film, which has been widely misread as offering a redemptive arc to an irredeemable person (or persons).
The irony is that the film is about the pitfalls of angry people needing to put their anger elsewhere, and how displacing anger onto other people or situations will only reap more anger in re-turn.
And if anyone thinks that the film is about redemption they must have been watching some other film. The movie ends with two angry characters embarking on a journey to hell and back: they’re on their way to committing a murder, and are unsure if they’re doing the right thing in the first place.
The unseen ending of the film is that they’ll keep turning around (or back) once they’ve decided to follow through on their reversal in direction: they’re damned if they do and damned if they don’t. Whatever they decide will only result in a perpetual changing of mind as they’ve nowhere else to go or put their anger.