I think it's for security reasons. The antagonist of the hero might have
easier access to Superman as Clark Kent, with his superpowers set aside?
Gina "Nanogirl" Miller
"Nanotechnology: solutions for the future."
>On something of a tangent, does anyone has any idea what the mythic
>justification for all the secret identities is? Why is it so important
>that nobody know that Clark Kent is Superman? Why is this such a
>universal feature of superhero myths?