Why?

The code was a poor hack, seen a lot better posted here.

The idea behind the email virus was clever but that came about before the melissa virus anyway, they just copied the idea and added a bit. what's the big thrill?

I'm not a programming purest who says "don't make destructive code" but credit where credit's due there's not much special about the code an little to be learned. Merely an unoriginal idea to deliver a simple payload with a kill statement.

1 point for the script kiddies I think, they've learned to use the API and plagerize ideas.