I don't know T. I don't like Bob Dylan stuff, so I don't generally listen to it. That song above ..... well I DO quite like Fairport Convention, but not that particular one.
I think it's always had its audience, but like anything which isn't mainstream, it tends to draw particular types of people to it. Thankfully, festivals now allow every kind of music to be heard in tents away from the main stages. Anyone can wander in, and they DO do. I think some're surprised by what they find themselves enjoying.
People who've never performed in front of an audience before can participate at places like Glasto, and because so many people go, everyone gets heard. You get folk just sitting there (not in the Glastonbury mud though!!) and then they'll pick up an acoustic guitar and start strumming away. Doesn't matter if no one knows what the tune is. There're always people who'll stop to listen.
I think you misjudge people, Archie. There are decent people at ALL musical gatherings, and some who aren't. You don't go to these things to try and decide who slots into a "good" lifestyle. In any case, Sandy Denny drank like a fish and took drugs.