The list of banned sites appears to be several years old, so inadvertent posting of unusable links seems inevitable.  

Is there a means of removing one's own link if one finds that it is a re-post, copyright violation, dead link or link to a banned site?  

You can edit your post to remove any unwanted links.

What if an unwanted link is the only content of your post?

How do we remove our post?

I'd be more than happy to do that for you. PM me with the link(s).