Jack always has a lust for power. He states at the beginning of the novel:
“I ought to be chief,” said Jack with simple arrogance, “because I’m chapter chorister and head boy. I can sing C sharp.”
He dislikes the idea of an election and is angry and upset when the boys choose Ralph as their leader:
Even the choir applauded; and the freckles on Jack’s face disappeared under a blush of mortification.
Yet, significantly, at this point Jack accepts the verdict of the group and acquiesces to Ralph's offer that he be head of the former choir boys, which can now become a band of hunters. Jack is still living within the confines of civilized life and conforming to a social order that runs by rules and norms.
It is only later that Jack realizes he doesn't have to be obedient and rule-bound on the island. He changes by allowing his id, or innermost desires, to take hold. He does what he wants to do, which is to indulge in savagery. As he realizes this appeals to the other boys' most primal,...
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