Pan-Islamism aside, there were mass protests over those Danish cartoons a few years back. I don't claim to understand other cultures and religions, but I'll be surprised if mass internment is less outrageous. So where are those people?
The folks in power don’t care about Muslim minorities (Palestinians, Rohinga, etc.). They care about browbeating the West and Israel, and spreading fundamentalist Islam as an alternative to Western secularization. Complaining about Chinese treatment of an ethnic minority does not serve that purpose.
It’s employed as a distraction or means to vent rage at a palatable target. The Danes, the Jews, Israel, Americans, that serves a dual purpose. “Oh you want more freeeom of speech? See what they do with it in Denmark! You want a democracy... like America? Like Israel?” China is a valuable trading partner and a government in the same model as the autocracies of the Middle East, so they shut up about that. There’s always been profit in turning domestic rage against Israel in general, and Jews in particular. It’s been a way of life for the house of Saud for example, even as they quietly make deals with Israel and bomb their fellow Muslims in Yemen.
Mind you, that’s the governments, out of over a billion Muslims worldwide no doubt many individuals are outraged over China’s treatment of their co-religionists, but they don’t have an effective platform. They also have to be careful depending on where they live about whether or not to even try to voice it.
