Uyghur’s aren’t one big monolith and treating them as one is reductionist and frankly a little racist.
Up until 2017-2018 the US was striking ETIM training camps on the border with China… But by 2020 “ETIM no longer exists.” It’s not like extremism in the region is entirely unexpected, and similarly China’s response has taken the dragnet approach for catching extremists. It hits a good chunk of innocent people, yes (give me a perfect response to terrorism), but it’s not systematically targeting all Uyghurs and it’s trying to do so without killing the human capital that China relies on for economic growth (particularly because ethnic minorities are the only ones reproducing above replacement rate in China).
That’s why Muslim countries are pretty much unanimously in support of China’s actions in Xinjiang.