Value Points :
The Mariner had killed the harmless Albatross, sailors suffered, they hung the Albatross around the Mariners’ neck as a mark of punishment to remind him of his sin and to make him feel guilty for his sinful deed.
Detailed Answer :
The Ancient Mariner had killed the harmless Albatross for no reason. The others blamed him for the sufferings which they were undergoing. They were of the opinion that it was all due to the killing of the bird. So they hung the Albatross around the Mariners’ neck as a mark of punishment and a constant reminder of the sinful deed which he had committed. They also wanted him to feel guilty for that deed.