Because it's a national security threat. The real danger of a surveillance state is political/foreign actors using that information to gain advantage. It's one thing for individual's shopping habits to be exposed, it's another thing for the person's information to be used by bad actors for their own purposes.
I suppose this is a controversial opinion then, but I'm much more concerned about my government (US) spying on me than I am on a country I have never stepped foot in (China).
The real danger to me is the US govt based on their track record, and it's acceleration of surveillance and force over the last 4 years
That's fair, but concern about China should not be tossed aside; The U.S. is practically on the verge of a new Cold War with them, where the rules and regulations are nothing like we've ever seen.