Media is powerful. And even in the US, most of us self-censor our news (liberal vs conservative media) to the point where we're largely reading only views we agree on (HN is no different in that regard). I always find it amusing that we can all read the same news with different conclusions and come out thinking that we're right all the time.
A lot of people assume that people in China are unaffected by all the censorship, but even if they're aware of it, I wonder if censorship in China actually reduces cognitive dissonance at this point, and it's actually more agreeable to read censored news than not. Much like advertising or the opinions of our friends/family, ideas can be subtle but extremely influencing.