Thinking about it I realized that you can't really change or delete much that you yourself created.
You can't delete your own videos from the database, you can't delete a username, you can't edit a post that you made a mistake on (jbone can attest to that).
Everyone wants this stuff yet its not done. I mean it has to be all right if the person who created it wants it off.
And also taking away all of that "junk" data will save some server space for people who actually do stuff and update their profiles and videos.

