Why do you act as though the only people in the world who have a right to earn a decent living are Americans with few marketable skills? Why don't the poor, toiling masses in China matter to you, and why do you refuse to acknowledge the tremendous improvements in living standards they've obtained over the past 20 years?
Because they're not in the same polity. Why should people in one tribe care about the people in another?
Why stop there? If Americans aren't supposed to care about the poor Chinese, why should a Texan like me care about a poor Ohioan or Michigander? For that matter, why shouldn't every city and municipality in the country just close itself off and operate in a state of autarky, where no good or service can be brought in from the outside and we can all only buy and sell things from and to the people who live in our same ZIP code?