The goal of US foreign policy has never been to improve the lives of people anywhere outside the US. A sibling comment points out that one of our closest allies in the Middle East is Saudi Arabia, an absolute monarchy that publicly beheads dissidents and has incredibly sexist laws, yet the US does nothing, and we see nothing like the neo Cold War coverage that Xinjiang produces. The US will remain an ally of Saudi Arabia because that is beneficial to the interests of the US, not the people subject to the Saudi regime.
If you think I’m a cynic or conspiracy theorist, take a look at what the US has done in other countries since WW2, in many cases overthrowing democratically elected governments in favor of US friendly regimes: https://en.wikipedia.org/wiki/United_States_involvement_in_r.... This is what the US has always done to other countries, expecting them to care about morals or improving anyone’s lives is missing their goal completely (and taking their propaganda at face value).
Whatever the goal of confrontation with China is, improving human rights is the least likely possibility.
So the BS meter is rising.
US has been doing that since 1978. US capital and domestic market improved China's economy tremendously. And in the process US capitalists get astronomical amount of profit.
Should US interfere China's political system?
Sure. But since China is so powerful in its military. I see no reason that US can force that upon China.
I don't quite think the idea that the country needs a "coherent moral framework" to justify taking action to improve particular moral issues. China itself has a coherent framework, but it's wrong and promotes grave injustice (coherence does not mean correct).
Maybe to better understand each other you could comment on my criticism of making "the perfect the enemy of the good" since I think that's the defining issue that's causing me to struggle understanding your point of view.