There is no such body as the Folk Police, and the Chief Inspector has authorized me to say so.

Jon Bartlett, Det.Insp.

Seriously - "folk police" is merely an insult, akin to "politically correct": it's a phrase used by folk who feel they are being (or have been or might be) criticized for something they've done/not done - a projection, if you like, of a) their fears that the putative critic is right; b) their anxiety over not knowing whether their act or omission IS blameworthy; and c) their unwillingness to deal with the substantive issue. If you are someone who does any more in folk music that sing or play, you too will one day be accused of being a member.