But then they'd never sell, and would be lost to new generations.
For example, Enid Blyton's works were magical to me as a child. When my eldest was born, I picked up my husband's childhood copy of Mr Galliano's Circus saying how much I loved this story, and I read a few pages.
I got as far as Lotta introducing her pack of performing dogs "This one's N----r, this one's Darkie..." and snapped it shut. It's not ok. I can't give that to a child.
But it's a change that could easily be made so that children today can still enjoy the story. A children's book is a commercial publication or it's a historical relic. Sometimes it can't be both.