>The goal of a host society should be to study where the differences present themselves acutely and how to alleviate the pain and rejection of individual emigrants without accepting extremism or compromising the values of the culture into which they have immigrated.

Doesn't that presuppose the conclusion? That such emigrants should be received regardless of how fundamentally different their hard drives' formatting is? Why should that be?

If South Korea did not have strong familial and ethnic ties with North Koreans, it would never accept any NK defectors at all, and said differences in software would a big reason why. Heck, one can imagine the South putting up walls to prevent a large-scale influx of North Koreans after the Pyongyang regime collapses.