Srd on CE characters:

Chaotic Evil, “Destroyer”

A chaotic evil character does whatever his greed, hatred, and lust for destruction drive him to do. [...] If he is simply out for whatever he can get, he is ruthless and brutal.

Evil is not a religion or a life philosophy in third edition anymore. A CE character does not need to commit evil for the sake of evil, they need just to be 'out for whatever [they] can get'. Think about the typical CE goblins.