This reminds me of Franz Kafka: His greatest works were published post-humously against his wishes (he wanted to see them destroyed). I think we can all be thankful that his friend decided not to heed his wish.You feel that if someone like Hendrix make something he's embarrassed by, or feels is sub-par, or is too personal, or for any other reason decides he doesn't want to distribute it, you feel you have a right to it which overrides his own wishes?
Or take Tolkien: It's a similar situation (and thematically more appropriate for the site).
I wouldn't go so far as to say the public has a 'right' to anything, but I can see how it can be for the greater good to override an author's wishes regarding publishing his works (post-humously, at least).