I don't think it is surprising that those who find folk music supports their political leanings are more likely to be on the left than on the right (although some far right groups have tried to appropriate folk music to their own ends). That does not prevent people with different views from enjoying the music, and it is not necessary to agree with a song in order to appreciate it. However a concert is not an appropriate place to start a political debate. If people disagree strongly with a song they can walk out.

It is also unsurprising that it is the most extreme views, at both ends of the spectrum, which attract most attention and debate. However on Mudcat I see all shades of opinion expressed.