The boys steal Piggy's glasses.
Piggy's glasses help him see; symbolically, they represent the ability to think clearly and logically.
By stealing Piggy's glasses, the boys descend further into savagery; they lose the ability to think rationally and logically.
"The Cossack as the cat; he was the mouse. Then it was Rainsford that knew the full meaning of terror" is the best detail that supports that claim.
They really want to follow it
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