Who wants to hunt? Join me! I am the chief! FUCK that conch!!!
Theme1:Humanity is originally evil, which would cause unbelievable consequence without constraining of rules. Without the laws, Jack killed Piggy and tried to kill Ralph because they were against him.
Theme2:In many cases, if people united together, they would overcome the difficulties. But individuals fight with each other because their own desires and ambitions. Jack wanted to be the leader and hunt, so he refused to work with Ralph even though keeping the fire going benefit all the kids.