"In my opinion, performing traditional music is a conservative activity per se, and "in most countries" and ethnic contexts, it is firmly connected with the dominating forces. Only in societies where "folk music" is defined to be the music of a lower class that collectively struggles for more recognition, performing it may be viewed as a statement in favour of that struggle."

I think you're being a bit theoretical. Folk music is pretty good at evolving. Song tunes change, words are added, lost or altered, even parodied. Go to an Irish session as a stranger and you wouldn't believe how nearly all the tunes are different to "your version". There can be a bit of a rebellious, even subversive streak in folk music. In some ways, it's what keeps it vibrant. The best folk traditions may be a bit cONSERVATIVE (I did that on purpose), but not all that reactionary.