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"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.)
"I expect the beast disguised himself."
"Perhaps […]. We'd better keep on the right side of him, anyhow. You can't tell what he might do."
The tribe considered this; and then were shaken, as if by a flow of wind. The chief saw the effect of his words and stood abruptly. (10.142-143)
Fear, says Golding, is one of a leader's most powerful tools for controlling a society. (And this is before anyone had to stand barefoot in an airport security line.)