We have more than our share of whining immigrants in the West, including here in Sweden, forever demanding “equality” and insisting on moving in more and more immigrants.
We easily recognize the arguments they have used: the aging population, the (short-term) international financial benefits, etc. Never do they mention the loss of cohesion in society, or the fact that your own people will eventually lose control over their own territory and their own destiny.
It makes me ashamed when a white man does the same in Japan. Let me offer a piece of good advice to Japan: Do not listen to that person. Even tolerating such subversive argumentation means digging your own people’s grave. The Japanese should consider themselves warned.