The Case of the Speluncean Explorers

A fictional legal case about a team of explorers who got trapped in a cave and ate one of their own to survive. Summary:

From the testimony of the defendants, which was accepted by the jury, it appears that it was Whetmore who first proposed that they might find the nutriment without which survival was impossible in the flesh of one of their own number. It was also Whetmore who first proposed the use of some method of casting lots, calling the attention of the defendants to a pair of dice he happened to have with him. The defendants were at first reluctant to adopt so desperate a procedure, but after the conversations by wireless related above, they finally agreed on the plan proposed by Whetmore. After much discussion of the mathematical problems involved, agreement was finally reached on a method of determining the issue by the use of the dice.

Before the dice were cast, however, Whetmore declared that he withdrew from the arrangement, as he had decided on reflection to wait for another week before embracing an expedient so frightful and odious. The others charged him with a breach of faith and proceeded to cast the dice. When it came Whetmore’s turn, the dice were cast for him by one of the defendants, and he was asked to declare any objections he might have to the fairness of the throw. He stated that he had no such objections. The throw went against him, and he was then put to death and eaten by his companions.

Was it right for them to kill and eat someone who wanted to opt out of the arrangement?