Asians are perfectly compatible with western society's predominate values, they even come to us already racist. hard workers who prefer to be self employed at well run businesses with high natural IQ and solid focus on STEM careers. no one is really scared of an asian take-over, let alone from places like Korea or Japan. Korea and Japan themselves are scared of a Chinese takeover of the globe, and with good reason, but that's about it. China can't possibly continue on it's current trajectory and will see a continued issue with feeding and housing it's people, and it hasn't even hit the mushroom of population growth yet.
They can be and do w/e they want, just not here.