Consider this: A pack of wild Foreigners.
Savage, googly-eyed Foreigners nearing your nippon home. Trampling your nippon tatami. Not raping your nippon daughter.
And you can't do shit since they're savages. The Foreigner leader grabs your computer and installs Unicode-aware programs.
The primal Foreigners finally dominate your household. They watch Western cartoons on TV and you are forced to be their slave.
Such is the downfall of Nipponjin.