[chrischen]

Except that being a fairly homogenous place saying "China" has in all practical purposes the same effect as saying Chinese.

That being said, see my other replies on how the OP's assumptions may very likely be wrong, and attributing hackers to China has the same effect as calling the coronavirus "China virus" in that for all intents and purposes it has the effect of associating Chinese people with hackers in the same way that calling the coronavirus is an attempt to deflect blame to a particular group of people.