User blog comment:BertH/User rights updates for Forum and Message Wall/@comment-26246584-20150124165249/@comment-452-20150124171030

Removing and deleting a thread (using the normal menu) does not remove it from being publicly accessible, and never has.

An admin has always been required to fully delete threads, and most admins probably don't even know how to do that. (Of course, most users don't know how to view soft-deleted threads, but if it were my identity, I would not want to risk it.)

(I've been reporting "Threads marked as deleted are publicly accessible" to Wikia staff for a very long time, but it has still not been fixed.)

As it says in the post
 * Regular users can - Remove, restore, close and reopen threads on their own Message Wall

If a spammer posts something on your wall, you can still remove it.

Admins are intended to have all the abilities of moderator, and to grant/remove the moderator right. (This should be fixed now, if not, report it.)