Well this question goes to the essence of what becomes of the majority of the boys in Lord of the Flies.
Jack is a prime example of how the boys regress into savage behaviors. He is a part of a group of boys who are in a choir and seemingly have strict rules at their school. However, once the boys establish a lack of authority on the island, Jack takes over and they find amusement and entertainment by killing animals and playing at killing each other. Jack recruits other boys on the island to partake in their savage games because it is enjoyable. The boys do not wish to govern themselves and create rules because it is not fun.
Ralph, conversely, tries to make rules, follow rules and find ways to get off the island. He struggles to keep to the strict rules on the island because the temptations of being savage are enticing. Once, he gives in, and Simon ends up dead at the hands of Jack's group.