Getting to know Japan is hard work: a complicated language, cultural esoterica, mixed messages about prudent paths to take. People who find their way around and assimilate deserve kudos and respect.
And reward. The Japanese government should welcome them by granting Permanent Residency ("eijuken"). But recently people eminently qualified under PR guidelines are being rejected — even Japan's first Caucasian geisha!
First, why PR? Well, try buying a house without it; most legitimate financial institutions (those run by individuals who still have pinkies) will not grant major loans.