Though he appears to have some desire for rules and civilization when he first appears, it is clear that Jack's forcing his choir to march in a line and wear their togs was not about order or rules but about power. Jack quickly realizes the need to have hunters and he is eager to exercise control over that aspect of the boys life on the island after Ralph is elected chief.
Because Piggy and Ralph represent society and order and rules, Jack immediately begins to be in conflict with Ralph both for leadership and over how they should organize life on the island in general. Jack believes that hunting and getting meat is far more important than the fire and the fire's connection to rescue so he immediately neglects that responsibility and focuses on the hunting.
As time goes on, Jack's ties to society grow thinner and thinner. He begins to organize the game where the boys pretend to stab and kill the pig, he argues that they can hunt and kill the beast, and he begins to paint his face and give in to the savagery of the island. Jack openly fights against Ralph's leadership and Ralph's desire to have order and rules and, in the end, triumphs and gains control of the entire group of boys.