That's not a bug, it's a feature. Japan enjoys the advantages of having a civilized, educated, homogeneous, high trust society, and they're not willing to abandon that in exchange of what, low skilled workers they don't need and ethnic conflict?
> Mmmm... the Japanese have problems even reintegrating Japanese Brazilians,
That's no problem of the Japanese, but of the immigrants. They're the newcomers, they're the ones who should be putting all the effort to assimilate into the host culture.
And it isn't happening, not even with descendants of Japanese. Imagine what would happen with a radically different culture (no need to imagine, just look at Europe).
That's not a bug, it's a feature. Japan enjoys the advantages of having a civilized, educated, homogeneous, high trust society, and they're not willing to abandon that in exchange of what, low skilled workers they don't need and ethnic conflict?