Lord Of The Flies : The end of innocence and the "darkness of mans heart" are a consequence of the savage instincts in all people.

Lord of the Flies is a novel written by William Golding about a boy and his savagery. In the near future England is threatened by an outbreak of nuclear war. A plane full of English boys crashes on a deserted island alone and isolated. Over several months they show their true nature and are no longer what they used to be. The island has taken its toll on the young boys. Because their guidelines and …

…have to kill in self-defense although they do not want to, this instinct to live at all costs is within everybody and pushes them to try harder and go past the max. In WWII everyone fought for survival and to maintain civil peace in the world, but at the cost of creating anarchy. All the people fighting had become a savage and the end of innocence and the darkness in their hard was a consequence.