What language? If they have their own language, wouldn't there be plenty of jobs where they can just use their own language?

Are you pretending not to see how a language outside your tribe opens up more opportunities. The entire tribes of Africa and South America underwent the same massive foreign language reeducation now being demonized

No, I just want to understand. What opportunities exactly?

Plenty of nineteenth-century type jobs. Anything modern - anything that actually improves their standards of living - requires the ability to read and write Chinese.