Would be interesting to look at the etymology, or rather usage history (there is a difference) of terms like 'folk etymology.' It's a very bourgeois usage. Seems to be implying that the 'people', the great unwashed, that bunch of ordinary morons out there, as opposed to the elite grammarians and historians and other PhD experts, always get it wrong. 'Folk' in this context is synonymous with "false."

In other contexts this attitude can have quite sinister overtones. For example, just say a massacre of indigenous people occurred by members of the invading culture 120 years ago. Official records of the time say 30 natives were killed. But unwritten oral 'folk' lore passed down among the descendants of the indigenous people says it was more like 300. What is normally regarded as the more accurate? Just because something is not documented from its inception doesn't necessarily mean it is incorrect.