Also because of the appalling track record of QA/QC, and subsequent cover-ups, at every level of government and enterprise from regional to national.
In the 2008 milk Scandal, for example, the offending company Sanlu were aware of infants becoming sick December 2007, but refused to test until June 2008. Shijiazhuang city governance failed to report the contamination to provincial and state authorities September 2008 and Sanlu subsequently asked the Shijiazhuang city government to assist them in controlling the media's reporting of the recall.
https://en.wikipedia.org/wiki/2008_Chinese_milk_scandal
300,000 affected children were identified, among which 54,000 were hospitalized and 6 deaths were officially attributed to the adulteration and cover-up. If the government and industry were willing to collude to the detriment of their own populace so as not to sully the PR appeal of the Beijing Olympics, what level of care and consideration are we to attribute them in matters of low-consequence export to the West?
Very true, though it isn’t like we need to look very far to find similar instances of government and media collusion to control stories, laws passed to protect companies from liability for direct causally linked chemical dumping known to induce tumors, cancer, neurological diseases and other things, so on and so forth.
Every country seems willing to trade the lives or livelihood of citizens, much less people of other countries, to ensure their status quo. Some just pay more lip service to “rights” they will violate at the drop of a hat when push comes to shove.
The best part of this scandal is in a press conference a major producer, Mengniu, publicly announced that milk made for Hong Kong is not affected.
This one-sentence message demonstrates a lot of the problems of Chinese manufacturing if you think about it for a minute.
Yes, not having QA is one of the ways unscrupulous businesses boost profits. The answer isn't to say “everyone in China is like that” any more than it was to say “every meat packer in the United States will serve you dog meat and pink slime” but to accept that some things need to cost more.
I would also note that in the case of that melamine incident 2 decades ago, several of the business leaders involved got death sentences which seems relevant to the question of how much the larger country supports it. For example, I note that no member of the Sackler family has failed to die rich out of prison.