Recently, I asked this question on Physics SE. This was a case of myself not thinking things through before asking the question; in any case the question was not of high quality and subsequently (rightfully) received downvotes.
The question is one that is very hard to "edit" to become a high-quality question. It has been marked as "not suitable for the site" and "off-topic" (both of which I agree with, by the way). Thus, I am considering deleting the question; simply letting it staying here doesn't make the site better, and might encourage more low-quality questions.
However, the question also has an accepted answer and it has also been viewed 67 times (as of the current moment). I do not want the efforts of the contributors on the questions to be in vain.
Should I delete the question (for the good of the site) or keep the question (for the good of the contributors)?