And the end started when China was admitted to the WTO. They had this huge cheap labor force, a government that could centrally plan (in addition to ignoring little things like environmentalism or rights), and an immense wealth of resources. It was like a bunch of sheep letting a baby wolf into the barn. Now the wolf's all grown up.
What's wrong with giving billions of people chance to develop their country and experience better life? China is not "a wolf".
Nothing, but if you believe that laissez-faire capitalism is tautologically good then you can't blame your capitalist overlords for selling your job to China and refusing to backfill it, so you must blame China for developing themselves instead.
Its fine for China to develop. The blame is on them disregarding human rights and environmental outcomes to get there.
Which country hasn't?
So you think they could have been kept poor and isolated forever?