If you feel you have to put a warning on them somewhere saying at the time of writing some of the language was culturally acceptable then do but don’t rewrite them. They do something similar with Only Fools and Horses re-runs. It’s not acceptable today to refer to a corner shop in a manner it was regularly referred to in the 70’s and 80’s due to the owners origins for example, as Del Boy often does in Only Fools and Horses. Even though a lot of the owners were in fact from India not its neighbouring country.
For me it’s educational, it’s social commentary, it’s a measure of how far (the majority of us at least) have come in reshaping attitudes for the better. Writing out history is dangerous, whether that be a character’s name in a book or getting upset that the National Trust tells you where the money came from to build certain buildings, stately homes etc. Both left and right want to do it and it’s dangerous regardless of which “side” is doing it.