I would highlight the chant that the choir boys yell while on the hunt:

"'Kill the pig! Cut his throat! Kill the pig! Bash him in!'"

Combined with Ralph's observations when finally faced with the pig itself:

"The desire to squeeze and hurt was over-mastering."

And, finally, any description associated with Roger, the most evil of the boys:

Roger stooped, picked up a stone, aimed, and threw it at Henry— threw it to miss. The stone, that token of preposterous time, bounded five yards to Henry's right and fell in the water. Roger gathered a handful of stones and began to throw them. Yet there was a space round Henry, perhaps six yards in diameter, into which he dare not throw. Here, invisible yet strong, was the taboo of the old life. Round the squatting child was the protection of parents and school and policemen and the law. Roger's arm was conditioned by a civilization that knew nothing of him and was in ruins.

Some of the best quotes that illustrate evil is inherent in everyone come from

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