I love it.
And now for something completely different.
I had heard about the low caste in traditional Japanese culture (leather workers, tanners of hides, and grave diggers), but this story reminds us that this is still an issue in that society.
The larger astounding, unavoidable fact (in that the excluded minority are ethnically indistinguishable from other Japanese) appears to suggest that discrimination is part of our socio-genetic makeup, and that a truly egalitarian society may be contrary to the role that aggressive oppression appears to have played, in the evolution of species.
Thinking here of the natural urge, in bird nests, for the runt of the litter being pecked to death by the more-robust hatchlings.
Nature ain't pretty, and no human society is immune from dastardly behavior.
Why can't we all just get along? Maybe we're programmed to be otherwise.