What theme does Tom's and Daisy's disappearance illustrate in The Great Gatsby?

Quite simply, Tom's and Daisy's disappearance illustrates
their total disregard for anyone other than themselves; therefore, their escape can be
directly tied to the theme of corruption.

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I called up Daisy half an hour after we found
him, called her instinctively and without hesitation.  But she and Tom had gone away
early that afternoon, and taken baggage with them.

"Left no
address?"

"No."

"Say when
they'd be
back?"

"No."

Is
there any better example of moral corruption than a rich gal happily and easily running
from the law with her husband while making an obsequious lover the fall guy?  Thank God
for money, eh Daisy?  Adding to the evidence of corruption here (and adding to the
contrast) is the fact that our innocent little, Midwestern narrator, Nick, originally
thinks that Daisy is going to be as concerned for Gatsby's poor soul as Nick is.  You
called her "instinctively and without hesitation"?  Did you really think she was going
to pick up the phone?  Poor Nick.

In my opinion, Tom's and
Daisy's escape also proves that Daisy married Tom for security. She desperately needs
security at this point in the novel.  She's a murderer, for goodness sake.  She killed
Myrtle in a hit-and-run accident and then let Gatsby face the music. Tom and Daisy are
escaping (and with their money and with Gatsby as a scapegoat, they
can).