It shouldn't be terribly surprising that an old British guy was a bigot, nor that some of that bigotry crept into his works.
I'm not sure why this instance of censorship feels particularly egregious, though. It's ultimately for children, and we censor content for kids all the time. We do it with movies and TV shows and music, and I don't see much rage directed toward that practice.
Is it because it's a book? Is it because it's a medium that hasn't really been censored like this before? Is it because it was done posthumously? Is it the specific content being censored?
Something feels different about this one. Maybe it's just the fear that what was once sacred is now fair game for defilement, or the sinking realization that the dam is now broken and this will become the new norm.