What you say represents about 50% of Chinese researchers in my lab. Those that immediately return to their country after the PhD and you never hear from them again. The other 50% are the complete opposite: they cannot wait to get their family out of the country and never look back, explaining that the country is ruled by a bunch of crazy psycopaths. Curiously enough, there's almost no interaction between both groups, they politely ignore each other (and they are really polite and professional towards everybody also).