Explain Lord of the Flies by William Golding has to say about humanity or society.

It is significant that Golding's island on which the boys
of Lord of the Flies are stranded seems at first to Ralph a virtual
Garden of Eden.  For, it was in the Garden of Eden that man first sinned and embraced
the evil that found life in his heart.  This "darkness of man's heart" about which Ralph
weeps on the last page of the novel is the violent propensity in humanity that is deeply
inherent in their character.  It is an innate flaw from which there is no escape even in
civilization.

After the boys are first stranded on the
island, they carry with them some of the concepts of order in society.  When Piggy finds
a conch, Ralph, who has been elected leader, uses this conch to call the boys to
meetings at which no one can speak without first being recognized and given the conch in
an imitation of society.  Ralph decides that Jack can remain the leader of the choir
boys, who will now become hunters.  However, soon the envy and cruelty of the boys
causes them to separate and challenge or prey upon one another.  In Chapter Four, for
instance, the sadistic Roger throws stones at littl'un Henry who plays at the
shoreline.  However, he restrains his actions and does not harm the child because he has
been conditioned by society to restrain himself because of fear of reprisals.  But,
later, in Chapter Eight, Roger has abandoned society and become animalistic; imitating
the pig he groans and grunts.  In Chapter Eleven, having by this time been liberated
into savagery, Roger, with "a sense of delirious abandonment," leans upon a lever and
sends a pink granite boulder onto Piggy's head, sending Piggy to his
death.

Likewise, the character Jack abandons society and
descends into savagery by painting a mask upon his face, stealing the rescue fire, and
wreaking havoc among the boys.  His hunters, engaged in a fierce ritual of pretending to
beat a pig to death end up killing the innocent Simon, making him a sacrificial victim
of their evil natures.  Further, the hunters beat and terrorize the other boys into
joining them.  They chase Ralph, the final boy to be rational, and attempt to kill him
by burning the island showing the deeply inherent violence in
humanity.