Tunesmith, so could I - but Cobain exposed the song to many people who might never have otherwise heard it, at least one of whom liked it enough to want to find out more about it and learn it and sing it. And most of the information I found on the song while researching (some of it quite in depth), came from websites created by others inspired by his performing the song (if not his performance of it)

So at least some good (imho) came out of his rendition.

YMMV

Cheers