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To me, the ending of the movie has to do with Tommy Lee Jones coming to accept that his place as Sheriff has come to a close and that this is "No Country for Old Men". He chased Bardem, and found him in the hotel room. Rather than escalate the fight when he knows Bardem is there in the room, he walks. His belief if that evil always exists and that the ending does not have to be with him confronting this evil. His discussion with his wife at the end about climbing the mountain to confront evil is his way of telling his wife he is letting it go, that he doesnt have to be the one to face down the evil.
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