Why could it be suggested that Creon's edict in Antigone goes against the Greek values of life transitioning to death?

In Antigone, it is clear that
Sophocles, Antigone, and all of the Greek citizens of Thebes cide with burying
Polyneices as part of the gods' "unwritten law."  The only one who doesn't is the
vengeful and stubborn Creon.

Respecting the dead is a Greek
tradition.  In Book XI of The Odyssey, when Odysseus' visits Hades,
the dead spirit of Elpenor asks Odysseus to bury his body.  Odysseus
says,

The
first ghost that came was that of my comrade Elpenor, for he had not yet been laid
beneath the earth. We had left his body unwept for and
unburied in Circe's house, for we had had too much else to do. I was very
sorry for him,...

To which
Elpenor responds:

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Do not go thence leaving me
unmourned and unburied behind you, or I may bring heaven's anger upon
you; but burn me with whatever armor I have, build a barrow for me on the
sea shore, that may tell people in days to come what a poor unlucky fellow I was, and
plant over my grave the oar I used to row with when I was yet alive and with my
messmates.’

Antigone echoes
these words when she tells her sister:

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I will bury him: well for me to die in doing
that. I shall rest, a loved one with him whom I have loved, sinless in my
crime; for I owe a longer
allegiance to the dead than to the living: in that world I
shallabide for ever. But if thou wilt, be guilty of dishonouring
laws which the gods have stablished
in honour.

As
The Odyssey was written some 400 years before
Antigone, it is clear that the Greeks required burial rites for the
dead, even if he was a drunk who carelessly fell off a roof or fought against his own
state and brother in a civil war.