Why does Jack want lots of rules in Lord of the Flies?
In the second chapter, Ralph and Jack are still getting along with each other. To Jack's dismay, Ralph has been voted in as chief, but he has allowed Jack to have leadership of the choir boys--now hunters. After the boys have attempted to make a signal fire that ends up burning out quickly, Jack claims that the conch doesn't apply on the mountain, and he tells Piggy to shut up. Ralph seems to capture the respect of the boys by wielding the conch and speaking about rescue and rules. Jack probably wants to recapture some of his lost prestige, so he piggybacks on Ralph's comments. He takes the conch, which he had disdained just a few minutes previously, and says,
"I agree with Ralph. We've got to have rules and obey them. After all, we're not savages. We're English, and the English are best at everything. So we've go to do the right things."
He then offers his hunters as tenders of the signal fire and lookouts. This gains him applause from the other boys.
In fact, Jack's statement turns out to be ironic because within a few chapters he shouts, "Bollocks to the rules!" and he ends up being the most savage of all the boys. It seems that he is saying what sounds good here, to get approval from the boys, without understanding the importance of his words--or being truly committed to them.