China is no different than North Carolina was 30 years ago - "stealing" factory jobs from the traditional factory centers in the north. They cause the rust belt.
Politicians will always find foreign boogeyman to blame and stick tariffs on.
Markets go up and down. Currencies go up and down. The problems in the US economy and the stock market now are no more the fault of China than saying the US economy and actions by the FED caused the drop in the Chinese market.
Manufacturing has always, and will always, move to cheaper options. People have to train and be educated for different (higher level) jobs that have higer accompanying wages.
Manufacturing is already moving from some areas of China to cheaper areas of China. The rush to lower cost is inevitable. The Chinese are not always driving prices down. The quality and price is determined by the Buyer, not the Seller or Manufacturer.
There is an old joke about two buyers going to visit a Chinese T-shirt factory. The Japanese buyer has 3 assistants and they spend a week studying in excruciating detail every facet of material sourcing, and the manufacturing process - focused solely on quality and packaging.
The US buyer shows up, takes a glance at the shirt and says, 'Yeah, that's fine. Now, let's negotiate this price to get it lower. How can we makes things even cheaper."
That is the part about supply and demand that is unknown to most people. The Chinese factories build to the spec and quality the buyers demand. Go blame Walmart for the crappy quality stuff filling your house.