Peter Bellamy was some sort of Conservative, and it did influence the way he performed. Wouldn't have been a problem for me (I never saw him) as he was genuinely using that background as a source for artistic ideas.

There is a well known singer-songwriter in the UK scene who throws anti-abortionist propaganda into his act. I've never seen or heard the poisonous little shit and never intend to. That's completely beyond anything I regard as tolerable.

There are some performers in the Borders who do the local hunting songs in a way that rather strongly suggests support for the whole hunting/Countryside-Alliance/forelock-tugging-rural-Toryism bag. I can tolerate a certain amount of that for its anthropological interest (and sometimes, terrific singing) before deciding I'd really rather be somewhere else.

I used to live in an Orange area of Glasgow. Their music was genuinely fun, but they would never have thought of themselves as being "folk" and neither would anybody involved in the officially-named "folk" scene (except maybe Adam MacNaughton).