Answer:
The overarching theme of Lord of the Flies is the conflict between the human impulse towards savagery and the rules of civilization which are designed to contain and minimize it. Throughout the novel, the conflict is dramatized by the clash between Ralph and Jack, who respectively represent civilization and savagery. The differing ideologies are expressed by each boy's distinct attitudes towards authority. While Ralph uses his authority to establish rules, protect the good of the group, and enforce the moral and ethical codes of the English society the boys were raised in, Jack is interested in gaining power over the other boys to gratify his most primal impulses. When Jack assumes leadership of his own tribe, he demands the complete subservience of the other boys, who not only serve him but worship him as an idol. Jack's hunger for power suggests that savagery does not resemble anarchy so much as a totalitarian system of exploitation and illicit power.
Golding's emphasis on the negative consequences of savagery can be read as a clear endorsement of civilization. In the early chapters of the novel, he suggests that one of the important functions of civilized society is to provide an outlet for the savage impulses that reside inside each individual. Jack's initial desire to kill pigs to demonstrate his bravery, for example, is channeled into the hunt, which provides needed food for the entire group. As long as he lives within the rules of civilization, Jack is not a threat to the other boys; his impulses are being re-directed into a productive task. Rather, it is when Jack refuses to recognize the validity of society and rejects Ralph's authority that the dangerous aspects of his character truly emerge. Golding suggests that while savagery is perhaps an inescapable fact of human existence, civilization can mitigate its full expression.
Simon is the symbol of a "religious leader" in the group of boys. He is kind and helpful to others and a caring leader for the younger children. He is a visionary who does not follow the crowd but seeks to understand knowledge for its own sake.
Simon does not follow the rules set by the group; he is not a follower. Simon has a hidden spot somewhere on the island to meditate, Simon gathers the best foods and gives them to the smallest children instead of caring only for himself, Simon alone seeks "the beast" in order to understand his own fears and face them, and to help the others acknowledge and conquer their fears.It is this which causes his death.Without Simon's "rule-breaking", many of the children will suffer as there is nobody now to help them survive. They are taken closer to the road of being uncivilized.The idea of a religious visionary is a universal theme in religions. For example, you could refer to Jesus Christ, the Buddha, Mohammed, etceteras. These are leaders who taught followers to seek the truth within themselves and then share it with others.
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