Well duh. We sell them the rope to hang us with, but first they hang their own.
From the story in The Atlantic, here:
What might the world have looked like had the U.S. never granted PNTR to China? One possibility is that China would have pursued an economic strategy built around fostering indigenous entrepreneurship and bettering the lives of its own workers, as it did in the 1980s. Instead, Beijing chose to transfer wealth from ordinary Chinese citizens to its politically powerful export sector, a path made possible by PNTR. China might very well have become just as rich by embracing a more balanced and humane approach to development. Doing so, however, would have required that its central government surrender a measure of control to its citizens. Rather than foster liberalism and openness in China, I suspect PNTR did exactly the opposite—creating the conditions for China’s central government to exert tighter control over the Chinese populace.