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You'd think that even a casual search for a subject like Tiananmen Square would be a wake-up call.That assumes they'd agree with the Tiananmen Square protests, which is quite a large assumption.
Some might disagree with any protest, like many of people in the US disagree with all kinds of protests (of left and right) -- e.g. because they're pro "law and order" and centrist --, and tons which disagree with protests of left XOR right.
Others might agree in principle, but still think China is better off without a regime change, which would be a huge unknown, and might even bring a huge 1.6 billion + country on the brink of chaos and civil war, with power struggles and what have you. Who said such a change is necessarily gonna be a peaceful transition? Officially or unofficially, they already have heard of stories of massive human toil in past power struggles (the "cultural revolution" for one), and might prefer stability and prosperity over democracy.
Or they could consider their situation just a-ok as it is, with its warts like many places have, but generally working well for the country (or for their personal interests).
Aside from propaganda, people also make their own minds, and what someone else, from another country believes they should be wanting, is not necessary what they do believe.