I recently wondered about a loss in reputation (-28), and I was confused, because I did not get a notification. Since the reputation loss was a little bit higher, I assumed that some user was deleted. I got curious when I did not get a mention about it in my reputation history.
After a while I noticed the 'show removed posts' button, what solved the mystery for me. Before the post was removed, I noticed that the answers in the thread were downvoted.
So it turns out that someone deleted a question that was closed, but how ever had more then one answer with a noteable amount of upvotes. Also the question was a little bit older, so I wonder about the reason to delete an answered question after a year or so.
A while ago, I got a message from a moderator, because I deleted some of my own answers, which I found were not adding anything to the site, or simply got no attention anyways. I was told to eventually see everything posted as a part of the site (more or less...). So it seems really odd to me, that a question gets simply deleted from the website.
For me it seems like an abuse of moderation tools.