Doug, sorry it took me to long to respond to this.

There is no simple fix for this. If you turn off users online then they won't see their username, which would make them less inclined to change anything, but then they will be someplace else rather than on your site. We could turn of the ability to see usernames period if you like.

The extra users don't hurt anything or consume any real space, you could find the duplicate email addresses and clean everything up that way, but in reality it's something you'll never be able to stop unless we turn the registration requirements into something that becomes really users un-friendly.

As far as the username issues goes, yes it is censorship, and yes it is warranted. Your website is your property, you hold the last right to what and how your material is presented. There is nothing wrong with deleting or changing content or restricting user names.