Lord of the Flies reveals the struggle between right and wrong and the moral choices the boys have to make when there are no "grown ups" to guide or direct them. Ralph, as leader, chosen democratically by a vote, even though it was based on his apparent power whilst holding the conch - "the trumpet-thing"- tries to behave in a way that instills order when he suggests that, "We'll have to have 'Hands Up' like at school.'" He knows that his father would expect him to behave in a manner appropriate for the son of a naval officer. He is supported by Piggy, who always considers what his "auntie" might do.
As they try to survive, the boys do things that adults would certainly frown upon and, gradually they lose their sense of what is expected of them. From their initial excitement and good intentions, they lose their "taboo of the old life," as they recognize that they no longer receive the "protection of parents and school."Things that were previously unthinkable become the norm. Jack, initially hesitant and unable to kill the pig, relishes this new-found independence and intends to take full advantage. Ralph and Piggy do try to maintain elements of respectability, "because we aren't savages" and they do recognize Jack's reckless streak.
The "snake-thing" or "Beastie" becomes taboo: "Snakes were not mentioned now, were not mentionable," as does Jack's own name - "'Jack'. A taboo was evolving around that name too."