In William Goldings Lord of the Flies what are three reasons shown in the text how Goldings illustrates that children, like adults, are not innocent.

If you are asking for examples of the children's lack of
innocence, you do not have to look far.  Roger throwing stones at Henry "just to miss"
in Chapter 4 is an example of the cruelty that exists within the children. The only
reason that he does not throw to hit is that he has been taught not to, not because he
is innocent:

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Round the squatting child [Henry] was the
protection of parents and school and policemen and the
law.

Jack's treatment of
Piggy in  Chapter 4--punching him in the stomach and face, breaking Piggy's glasses--is
another. He hits Piggy because Ralph humiliated him by accusing him of neglecting the
fire.  He hits Piggy because he knows Piggy will not hit back.  One chilling example of
the boys' savagery is their killing of the the sow in Chapter  8.  In this chapter they
are portrayed as bloodthirsty individuals who kill for the sake of killing, not for
food.  Killing the sow makes the boys "fulfilled,"  and of course this bloodlust results
in the death of Simon.

The reason for their lack of
innocence might be found in Simon's conversation with the Lord of the Flies in Chapter
8.  He tells Simon what Simon already knew that the beast is within.  It is Golding's
thesis that beneath the veneer of civilization, all human beings are savages.  Once the
rules and laws of civilization are removed, then our savage instincts are released, and
there are no restraints.