Let them out so that people can see what idiots they are. Don't make them matyrs by driving them underground.

I would say that in my experience of going to English folk clubs I have never come across anyone expressing BNP sentiments or performing racist songs. Every session I have been to opens its doors to anyone who cares to attend, anything to keep the tradition alive. Since I am not very knowledgeable about the folk scene in the USA I really wouldn't want to make myself look a prat by commenting on the political make up over here.