There are many islands whose immigration policies I wouldn't want to adopt.
The point is that Japan-until recently-took immigration seriously.
The Japanese didn't allow millions of immigrants-from distinctly foreign cultures, who would not be able to assimilate-to live there.
To the extent that a guest-worker program is effective in Japan it's only because Japan takes this problem seriously, although even the Japanese are becoming lax, in imitation of their American allies.
Which country's immigration and worker program do you think is the best?