alt Hacker News> Japan is a good real world example that you do not need to lean on immigrant labor to stop your country from becoming "dirty"; it's one of the most ethically homogeneous countries and also one of the cleanest places you can visit.
It's also one of the worst developed nation economies and has a massive old, shrinking population problem and is well associated with people having no kids, having no prospects for a better life, and having huge amounts of its population live alone shuttered from the outside world.
A good economy has many benefits and skilled immigration can significantly improve developed nation economies.
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To be clear, the economic performance of Japan is pretty similar to Italy. They have incredibly low population growth (or shrinking), but their GDP per capita continues to increase year-over-year. Surprisingly, quality of life is pretty good in Japan and Italy (the second will be a bit controversial here). As long as you have a middle class job, your life will be pretty good.
You would think that such a terrible, untenable, broken economy as I hear the Japanese economy described (oh no, it’s not growing fast! The horrors of checks notes equilibrium) would precipitate a very dirty landscape, vast swathes of nature torn down, civility breakdowns, mass homelessness, and a high murder rate, bridges collapsing out of nowhere, etc.
I’ve just described some famously “excellent economy” countries, but I certainly didn’t describe Japan.