could be way wrong... but it seems China has done two impressive moves. First they weakened their currency to make it attractive to manufacturers internationally, and then put tariffs in place so that they can maintain an economy built for the Chinese, by the Chinese. I think that's what they're un-interested in the low profit margins. I have nothing to base that on other than observation, but I think that's their goal.
Conversely, we built a system for Wall Street at the expense of our own people. We' been eroding our middle class for 30 years (at least). We've hidden that fact through productivity advancements in tech and cheap Chinese goods... it's getting mighty close to being time to pay the piper... The US is in trouble with the current set-up. It's always small business that solves this problem.