That was an unsettling ending, but that was the point of the movie. There was no happy ending. There was no ending...just a presumed continuation of bad things to come- just like Cormac McCarthy writes it.
Exactly... that was who the dude was... he just killed for whatever reason HE thought was right or whatever his “code” was... he said he was going to kill the wife, and he did.
Yes, it wasn’t a bad ending, just an unsatisfying ending for those who are hoping for a “Hollywood ending”.
Chigurh foreshadows the ending constantly throughout the movie with his coin-flipping monologues and dialogues to both Brolin and Harrelson’s characters so it isn’t like the audience can claim they weren’t being warned. Even Brolin’s wife and mother-in-law foreshadow the unhappy ending that is coming. Audiences just weren’t paying attention or didn’t want to believe it.