Well, that's certainly one subclass of "folk" music. Trouble is that there isn't any surefire definition. I have a hard time considering some of the "folk" singers of the sixties to be real folk musicians, and they do seem kinda fake to me. And the people who follow in their footsteps are at LEAST as nutsy as they were, politically speaking.
And then there's bluegrass! Bluegrassers have a tendency to be very conservative. Plenty of Bush and NRA stickers on cases at the last festival I went to. At a folkie gathering, those'll get you...well...can't say shot, but tongue-lashed, at least!