This is the deepest reason.
Doubting his wife and younger brother, and finding fault, are just the venting of that hidden knot.
Even without his younger brother in this story, I think he'll find other faults to vent when he gets home.
The collapse of values, the image of a hero on the outside, but the inner suffering is always tormented. Actually, I think it's really schizophrenic.
I think he has to bear this heavy cross for the rest of his life.
I don't know if there is a good psychiatrist who can get him out.
So he asked to go back to Afghanistan.
I think he wanted to kill himself on the battlefield to wash away his sins.
If a person has no conscience, he will not feel guilty.
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