There's certainly no question about propriety. If your question should be closed, it probably should be closed. But there are a few options:

 - **Delete**. If you completely messed up and your question was a problem caused by you, and it's never going to be useful to anybody else, you could nuke it.

 - **Answer it yourself**. I've actually had pebcak issues that I've solved, posted the answer and have since turned out to be very common issues. Posting the question and answer helped other people.

 - **Accept what would have been the most useful answer**. Sometimes I'll do something very wrong, float a question out. I'll get a few valuable (but incorrect) answers back beforeI notice that I accidentally moved `/etc/` to `/bananahammock/`.

    An answer of `sudo mv /bananahammock /etc` is not going to help anybody else because few people are as stupid as me.

    So then I look at the answers that were there. People suggesting good diagnostic issues that could help the next person in a similar situation. It's not just a case of clicking accept. If you pick something useless you might lead future visitors up the wrong path completely.

 - Or **vote-close** it, as you suggest.


You just have to think what's most useful to other people. What option delivers most value?