[powerapple]

I believe the decision was made mainly over the concern of food supply. If you haven't already known, 195* many people died from hunger. Minorities have enjoyed more relaxing restrictions and often these policies are not enforced unless they have proper jobs (governments, CCP members and so on, breaking this could mean the end of your career). Many minorities are in small number to begin with, then the large minorities such as Tibetans and Uygurs are in tens of millions anyway. It is very different from Japan or other countries.