I once visited a museum which had a large number of lovely wooden medieval sculptures of saints and virgin Mary etc. which had been collected from various medieval churches. Most of them had arms cut off and noses erased, because of the reformation of the church after Martin Luther etc. Those who did this to the sculptures felt very strongly that they were in the right, holy and righteous.
Most of us would see that as vandalism today, whatever the justification. So I believe it is a good thing to remember that our era, too, will in the future be found wanting in some ways we still can't quite fathom (perhaps the idea that people tortured and killed other animals and then ate them after prolonged imprisonment).
I can see why different editions and versions are necessary for non-fiction work which is still used such as the holy books of religions (not all allow any changes as the book is seen as literally divine in each (translated etc.) word) and encyclopedias. But even in those cases readers are informed about the fact that changes have been made, either by numbering the editions or by using forewards or explanations in the text.
Should we alter works of fiction or art which individuals created and copywrighted (so-to-say)? I don't think so, though perhaps such altered works could be called something different, say, "based on original works by Roald Dahl"?