No country joined WW2 to liberate the Jews. No one is going to fight China for the Uyghurs. These are atrocities that help sell the morality of a war fought for other reasons. Defeating the Nazis was certainly a moral victory and they were a great evil, but that’s not why we fought them.
No one is coming to the rescue of the Uyghurs. Enduring sanctions is likely to be the worst consequence China faces.