Earlier quoted context omitted.
so all japan needs to do is completely destroy their own culture, its so simple now
Japan has been influenced by the rest of the world for millennia - just recently there was an article posted to HN about ancient Persia having envoys to Imperial Japan[0,1], to say nothing of China, which is probably responsible for just about everything you associate with "Japanese culture," or the Western influences behind the Meiji restoration and postwar government. All cultures change over time, even the ones th…
We often think of 'Tea' as a very English thing (and it is in many ways now), but of course it has it's roots in China/Asia i.e. global trade.
The Japanese borrowed ideas from elsewhere for quite some time (as has everyone of course), but they would view 'building Western warships' as something very different from 'importing millions of Westerners'.
Also, one could argue that Japan, for a variety of reasons, was far more isolated than other places.