If recent thread deletions are by moderators why not inform members of your actions, ideally with a brief statement of the reason. It appears that there is a new swathe of moderators recently, so you may be unaware that this happened before - threads disappearing without even a private message to each contributor explaining. There are community rules. If these are broken, fair enough to uphold the rules, but you should tell people the nature of the infringement too.
Unless a hacker has gone in, though that seems unlikely that they would so selectively remove the 2 threads that I am aware of.
