If you have eleven million Uighurs, you are going to have some who support fundamentalist Islam and want to spread it. Those are the ones that you want reeducated and taught that laws in China must be followed.

China is a Communist country so it can't discriminate against any ethnicity, practically by definition. Read the lyrics to the Internationale. The only race is the human race.

https://www.marxists.org/history/ussr/sounds/lyrics/international.htm