I agree with you, in fact.

The issue is that the fact they decided to impose a single language to all the country is another example of the nationalism I was talking about. Deciding to erradicate existing languages and cultures for nationalistic reasons. That is cultural genocide. It's not unlikely of what Chinese are doing.

You can contrast this with the case of Switzerland or India where you see you can have a strong cohesion and feeling of belonging to the cpuntry without needing to erradicate significant parts of your own culture.