Within them all, the beast is the evil that causes commonplace disorder. Before his complete reversion to savagery, Jack describes hunting “as if [one’s] not hunting, but—being hunted; as if something’s behind [one] all the time in the jungle." Since he says this after a hunt, a parallel is made between it and the beast.
The act of killing, being unacceptable according to civilized standards, is associated with dire evil—only the cruelest resort to it. It portrays the innate evil within Jack, as he knows that killing would not be tolerated in civilized society. Therefore, it is evident that the beast is present when an individual is aware that they are committing an evil act. Although it does not manifest itself in an apparent form at first, it represents a guilty conscious that comes about when they allow their innate evil to surface. Undoubtedly, the presence of the beast and the fear that they have for it, is what turns them towards more violence.
A reliance on weapons not only for hunting, but also to protect themselves, evokes their innate evil. The boys are entering a distant reality, in which the existence of a false beast, and their inability to perceive this, leads them to value violence over morality. Furthermore, the evil within the boys is also seen when the beast takes a physical form as the Lord of the Flies.
Taking the form of the sow’s bloody head on a stick, it is a direct result of the boys’ fear of the beast and dominance of their inner evil. In fact, with its confrontation with Simon, it clearly states that it is a part of them—it is the barbaric instinct deep within them. Consequently, the Lord of the Flies is a direct symbol of the power of evil; a figure which evokes man’s inborn evil to take over.
Since the hunters have gone so far as to present the beast with an offering, their belief in the beast, and therefore their innate evil, has solidified to an extent that turns them to violence. All moral and ethical concerns are pushed aside as Jack’s tribe ruthlessly murders Simon, who they mistake as the beast.
The fact that Simon, the only one who knows the beast is an element of human temperament and can relieve their fears about the beast, is killed, illustrates that evil is an inescapable quality of their nature.