Woody Guthrie was a Communist, and Communists are totalitarians. Everything they do is for the Cause. They never deviate from this principal. They are "soldiers with guitars/pens/whatever." Have you never read how one Communist writer in Hollywood who said that not every single thing had to be about politics was raked over the coals by his comrades and made to grovel and recant?
Perhaps you are unaware that Guthrie and Seeger stuck with Stalin all through the non-aggression pact with Hitler (y'sh"z), traveling about and singing "peace" songs against interventin . . . until their "motherland" was invaded.
The Carters weren't Communists.
I’m perfectly aware that they were of 1930s style Marxists. I was wondering what made their folk music ‘fake’.