I would say that Piggy's death was in no way related to the boys' survival in Lord of the Flies. Piggy was certainly no real threat to the other boys in respect to their physical well-being or their long-term stay on the island; in fact, had the other boys listened to Piggy's ideas and taken him more seriously, their life would have been better. Piggy is only a threat to them in two ways: First, he still believes in the power of the conch shell, and when he holds it up shortly before his death, even Jack's tribe becomes silent. He and the conch still represent a semblance of democracy and civilized behavior, and he is killed by Roger out of a desire for blood-lust, who exhibits a "delirious sense of abandonment" as he sends the rock crashing upon Piggy below. The conch is also destroyed when Piggy is killed, and Jack celebrates by promising Ralph a similar fate. Piggy's glasses are also a threat to Jack's tribe; without them, they cannot create fire. However, Jack already has stolen the glasses, so they no longer present a threat.