Board Thread:General Discussion/@comment-452-20130418224345/@comment-5887706-20130418224818

If they're automatically removed after being deleted, it would be removed from everyone's list, and were the thread restored, it would have to be highlighted again and so forth. Some people also like record of those threads (as having existed in their list for however long they stay) regardless of what it had said.

And not knowing if there were genuine notifications is a simple mistake. Next time you'll be more careful and scroll down fully!