This really has gotten to the point of being entirely silly. Why? Well, let me see...
If you post a story to the library and want it removed and the site admin won't remove it - highly unlikely if you are getting published (why? cause they won't want the new publisher to litigate) - just post an update to the story with modifications. Simple as that.
Moreover - This is a public chat board. You don't want everyone and anyone to have access to what you post you should go elsewhere. If I want to make this entire line of chat public where no one can touch it but me all I have to do is save it a post it somehwere else - myspace, yourspece, facebook or any free web host. Hell, I can paste this entire web page on anywebhost.com.
So, go ahead and bitch about you not having the ability to have your shit removed. Guess what - you have zero control once it hits the web. Zero. At least the site owners make it clear on this site...remember, anyone can still grab everything off this site and load it elsewhere. Once it is in the public venue you have lost privacy of the piece. Quit whining.