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Answer:
In my opinion, the Ancient Mariner's punishment was fair, and his fate was worse than the sailors'.
Step-by-step explanation:
In The Rime of the Ancient Mariner (1798), by Samuel Taylor Coleridge, assuming that the sailors' punishment was death, even though we are not certain about what final fate their souls had after that, their suffering could be thought of as less than the Ancient Mariner's, who is left alive but cursed with an awful fate.
Both the sailors and the Ancient Mariner are at fault for killing the bird that had saved them because the sailors praised him afterward. However, the main fault rests in the Ancient Mariner, who did the actual killing, and must carry the burden of being responsible for the death of his crewmembers.