Noone thinks it's an island untouched by the world. But a small degree of foreign influence over thousands of years, carried out by mutual trade of objects and

Noone thinks it's an island untouched by the world. But a small degree of foreign influence over thousands of years, carried out by mutual trade of objects and information, just isn't the same as the kind of mass immigration seen in the West, where the whole population becomes a minority in less than a lifetime. Such a thing has never happened in Japan in a thousand years; not even close. (It did happen before that, and the people who were there originally are not doing too well.) There's a fundamental difference between exchanging products and ideas, and mass migration of people. Stop trying to pretend that they're the same.