In his classic novel, Lord of the Flies, William Golding utilizes many elements of symbolism to help accomplish his motif, which is "man is basically evil." Symbolism can be anything, a person, place or thing, used to portray something beyond itself. In some way or another we all have that need for putting pain in others, even if it was just beating or killing a person or animal. .
In the novel Jack is first to show the nature of evil in his internal savageness. Jack is a tall thin boy with red hair in a black cloak. Jack's appearance seems to even suggest evil. As time goes on killing becomes his one priority. He tries to cover up his love by saying that the group of children needs meat. The truth is that he has reached a point where he actually enjoyed the sensation of hunting a prey. His intrinsic natural desire for blood and violence was brought out by his hunting of pigs. .
Jacks Id has taken over. The savage inside him that was pushed down by society, parents, teachers, and others is free to surface now. The evil that comes from jack is internal and now is able to be shown externally. It was he who had the impetus to kill and just focus on that one thing. No one suggested to him to hunt. He felt with no adults to put rules to keep them from having fun he may do whatever he pleases. Symbolically Jack breaks away from good when he puts the blood of the slaughtered pig on his face as a mask. He uses the mask as another way to free himself from society by hiding his identity when he hunts. This mask lets him be free with whom he believes he is. Jack also eventually breaks away from Ralph and the others and forms his own group leads to multiple murders of humans, not just pigs anymore.
Yes, since evil is contained within children so that must mean that it has always been in adults. It is those who know their own human conscience, which do not let the original sin emerge in their everyday life.