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[Ralph] was vexed to find how little he thought like a grownup and sighed again. The island was getting worse and worse. (8.243)
When Ralph notes order breaking down, he is quick to blame the island as getting worse and worse, not the boys.
"…I mean…what makes things break up like they do?
Piggy rubbed his glasses slowly and thought […].
"I dunno, Ralph. I expect it's him."
"Jack." A taboo was evolving round that word too.
Ralph nodded solemnly.
"Yes," he said, "I suppose it must be." (8.259-2.65)
Ralph and Piggy see Jack as the reason that all their rules and order collapse. In other words, it's the dark, bestial side of us that just can't resist trying to rebel. (They don't seem to realize that there's a teeny bit of Jack in them, too.)
"This head is for the beast. It's a gift." (8.224)
The head is meant to be a gift for the beast, but later it becomes a manifestation of the beast itself—which means that violence and savagery end up making the beast real. (Hey, no one ever said Lord of the Flies was subtle.)