Millions of years of advancement and development of human nature has made the entire population what it is known as today. While millions of innocent people were tortured and killed, those that were responsible of this gruesome act, watched from the side.
William Golding wrote Lord of the Flies to tell a story about his perspective on that question. Sam and Erich : Sam and Eric are twins who merge into a single identity, 'Samneric,' as the story progresses.
In much the same way, Piggy's demeanor and very character links him to the superego, the conscience factor in Freud's model of the psyche.
Free from the rules and structures of civilisation and society, the boys split into factions - some attempting to maintain order and achieve common goals; others seeking anarchy and violence.
Golding uses symbols, characters and objects to represent his main ideas and themes. Golding was trying to show the reader that the worst beast that exists is the darkness and evil inside of us.