All that said, Warner Brothers have had a much healthier attitude to this in my opinion - Making old, potentially offensive cartoons available but with disclaimers beforehand to explain the context and that they were a product of their times.
For me, this is the very definition of taking a healthy attitude towards things: educating rather than banning.
Take Anime Limited's BD release of the Japanese wartime propaganda film
Momotaro: Sacred Sailors, for example; that begins with exactly such a disclaimer from its distributors:
The film you are about to see is a product of its time. It depicts the beliefs, sensibilities, fears and aspirations of a nation that was then at war with much of the English-speaking Western world. The relations between Japan and the English-speaking West were, of course, vastly different then than they are today. While the following does not represent the views of Funimation or Shochiku, this film is presented in its original entirety because to do otherwise would be the same as pretending that this period in history — and the international climate of the time — never existed.
Indeed so: archive things so that people can take them out and look at them if they want, and help them understand the context. Then maybe something can be learned from it. That won't happen by trying to bury it out of sight or bastardising it to suit the world as it is today. Doing that would create a kind of
Nineteen Eighty-Four situation where history is constantly rewritten or deleted to fit the facts as they currently are.
(Film spoiler: in the end, the clever Japanese commander coaxes an unconditional surrender out of the bumbling, stammering Brits. For the record, it is the only anime on MAL to which I have not given a score out of ten as that's not really possible.)
To bring this back properly on-topic, the disc also includes a 1943 short film called
The Spider and the Tulip. The spider character is
every bit an offensive racial stereotype, and is everything I was expecting to see in that purported "blackface" cosplay. This film tailors the preceding disclaimer to warn of what's coming:
. . . It may depict the ethnic and racial prejudice of the time in which it was made. These depictions were wrong then and they are wrong today.
The spider's appearance can't help but put me in mind of 008 Pyunma's original character design in Shotarou Ishinomori's manga
Cyborg 009. That was mercifully changed in later iterations to address its (in my view) undeniably offensive nature.
Things progress.