When I was young in Scotland, "Darkie" was used universally to describe someone dark skinned. It was deemed offensive to call people "Black", as black contained a negative meaning.....only racists used "black" and always as a pejorative.
That more or less sums up the argument about censorship of traditional music, the songs should stand as they were written and used, it is up to the performers whether they sing them or not.
As I said on another thread, the censorship of art and culture leads to book burning and the death of freedom of expression.