David, sorry to see you go - I'm not sure exactly what triggered this but if you would like to be reinstated at any time please send me an email.
Naomi, the transgender thread you linked to was closed because it was getting to sound pretty offensive to trans people, and while I support the reasons for it being closed, I have reopened it with a comment in the hopes we can have a reasonable discussion of the news article while using the proper pronouns for the woman in question.
I think that sometimes threads are closed in error - perhaps a slip of the finger by scrolling, and they are then reopened. If you think a thread has been closed in error, please email us and we will take a look.