Piggy is the voice of reason, intellect, and civilization in the novel. He dies because he is never able to put himself into the shoes of Jack's followers and understand the allure for them of the giving into primal, savage, and irrational desires. He represents reason, but a reason that is too one-sided.
This emerges from the beginning, when he is unable to take on a leadership position as Ralph can. Piggy is very capable and has good ideas, but he can't relate well to the other boys, especially those of his same age, who ridicule him.
Piggy has asthma and is overweight, and for these reasons, he has not participated in sports or learned the joy of physicality. This has contributed to his lack of development of certain kinds of social skills, but more importantly, leaves a gap in his knowledge of life. Jack relies on appealing to the physical side of the boys rather than the intellectual—dancing, hunting, killing—and this is something Piggy simply doesn't understand. Because of his...
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