Go to any apartment in central in HK and you will find a 5 by 5 foot room serving as maid quarters. Then go out in central on a Sunday afternoon and you will see the streets packed with Malaysian and Philippine maids. Then go look at the stats on the number of Chinese businessmen kidnapped in Malaysia and the Philippines every year and tell me there isn't a problem. (http://en.wikipedia.org/wiki/World_on_Fire)
This problem doesn't exist anywhere in mainland China or Taiwan. And ultimately it is hard not to view it as an ugly byproduct of economic liberalism in these particular cultures.