This question, originally posed as this one turns out to be based on an incorrect assumption, which, I argue, is not easy to recognize, even might be considered a part of layman public opinion.
Should we close/delete, or keep questions which are tackling such urban legends?
In favour of keeping such questions that answers fixing them might be useful to debunk the corresponding myths. Of course, against keeping them speaks the fact that the question is based on incorrect facts and thus non-sense in its core. Keeping such would only spoil the Q&A site.