As I'm sure we both know, few of those billion people have anything to do with how the government makes decisions about enforcement against dissent. Power is concentrated to a group of people representing a small fraction of the population that is intensely conscious of its own political and historical identity.
The main problem in this thread is people engaging in whataboutism and obscurantism to signal sophistication, because they look at "is massacring civilians bad" and mistakenly think it's a trick question, and set about looking for oversimplifications to correct which they think are secretly attached to the question.
Just like aaron-lebo points out above, a dichotomy between hellish labor camps and flawed western democracies was never posed, yet somehow got corrected. Similarly, I don't think anybody in this thread ever suggested that the problems with the regime were the collective responsibility of every Chinese citizen from Shanghai to Kashgar. Yet those are the kinds of arguments offered in defense of Tiananmen in the name of signalling sophistication.