The other is the reaction of the younger son, believing in his father from beginning to end, which has to make people doubt whether he really saw anything, instead of being naive as the elder son said. Especially in the second half, when the elder son claimed that he saw God, the younger son yelled unfairly, saying why he could only see the devil. A child will not feel unfair about what he can't see.
In addition, his father's performance when he killed the sheriff was completely different from the usual killing. Claiming that he had killed someone for the first time. It was not a person who killed him before, perhaps because of a mental problem. However, the murderer with his hands full of blood shouldn't vomit and cry like the first time he murdered, and show signs of mental breakdown. He doesn't need to pretend to be so in front of his son who has always witnessed his every move.
Therefore, the father and the younger son are God’s messengers of justice, and the elder son is the devil. This identity has long been confessed. The suspense left to the end is only how the younger son died in the hands of the elder son, and what his intentions were for reporting the crime. Most of them should be detrimental to the FBI agent. The result was only half of the correct guess, and the ending was still unexpected.
From the beginning, the whole film made people think that the father went crazy and became a perverted murderer, to half-believe it, to the upside down believing that the father and the younger son were the righteous, but the sensible eldest son was the devil, and finally the eldest son who thought it was the devil. It turned out to be the youngest son of the righteous side, and finally got rid of the federal agent who had been worried about him but actually died. It's really twists and turns, but it is logically rigorous.
To say something profound, in fact there is no, more energy is in the twists and turns of the script. At most, God has been watching, and the evil is rewarded. This is also very straightforward at the end.
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