I wrote a small puzzle, which was downvoted badly either because not many people understood it or it has severe content quality problem. I assumed the second and raised a flag to request the post deletion.
Moderator response for the flag is:
declined - your question has upvoted answers, and we prefer not to delete others' high quality content, if possible.
I remember the question Problem in the middle of desert was deleted which had even more upvoted answer. (The answer I gave had ~50 net upvotes).
So what prevents first question from deletion while the other was deleted ruthlessly?