I'd love to read a longer story on this theme! The plight of the captain, and the stresses that led to his defection and betrayal, is an interesting theme. It's a pity you could only scratch the surface here!
Some technical issues detracted from the clarity of the piece, though: missing punctuation and over-long sentences disrupted the flow and took me out of the story. The inconsistent use of italics, too, was a bit distracting, as I tried to understand the pattern there.
But as I said, the core of the story itself contains a powerful theme. The captain's story, I'm sure, is a complex one!