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"Life […] is scientific, that's what it is. In a year or two when the world is over they'll be traveling to Mars and back. I know there isn't no beast—not with claws and all that I mean—but I know there isn't no fear either."
"Unless we get frightened of people." (5.99, 104)
There's nothing to be afraid of, says Piggy—unless we start to fear other people. Trust rational, scientific Piggy to understand.
“Maybe […] there is a beast
What I mean is… maybe it's only us.” (5.183-195)
Simon and Piggy come to equal-but-opposite conclusions. Piggy has a kind of rational, external, empirical attitude—we're afraid of each other. Simon has a more spiritual insight: it's not each other we need to be afraid of, but ourselves. Subtle? Sure. But it's an important difference.
Jack's face swam near him.
"And you shut up! Who are you, anyway? Sitting there telling people what to do. You can't hunt, you can't sing—"
"I'm chief. I was chosen."
"Why should choosing make any difference? Just giving orders that don't make any sense—" (5.238-241)
In case you haven't gotten it by now, Golding spells it out for us: Jack represents an autocratic government, where power is taken; and Ralph represents democratic governments, where power is given.