Is it OK to ask moderators with superpowers to delete heavily down-voted question? Where do I need to post my request? I tried to delete it but SE does not allow it because of existence of some up-voted answers?
The general policy across SE is to NOT delete unpopular questions. Deletion is reserved for offensive questions or spam. I'm ok with that, because heavily downvoted questions provide examples to users of how NOT to ask a question. Of course, the original poster is always free to delete their own questions.