This was addressed in the previous post. But here I go: There are predators of all types everywhere. The issue is not the nature of the venue, but the protection the venue affords. In a world with a disparity of power (in other words, THIS world we live in), people will take advantage of other people. When a particular venue offers a lack of oversight, or a perversion of oversight, more advantage will be taken.
We have seen this in religion. We have seen this in sports. And we have seen this in ENTERTAINMENT. Politics is so obvious I'm only mentioning it here because if I don't mention it someone will mention that I didn't mention it.

So, is folk music simply part of ME TOO or is there a special reason for particularizing it here and now? Is there something about folk music that offers a special protection for this kind of behavior?

The main invitation to the misbehavior seems to be a common assumption that "It can't happen here."