@jaytkay—What??
Sorry, there has been lots of violence in China since Tiannamen, overt and covert. Just in the past 2 years, there’s been a lot of unrest in a variety of regions including Tibet and Xinjiang and Urmuqi, Xinjiang.
There are many people here in China pushing for political freedom, but sometimes it’s hard to know how. Here in Hong Kong recently they just put back the promised date (previously 2012) of a full blown democratic election of the Chief Executive, and it’s frustrating, very frustrating.
However, in a protest of 500,000 people on July 1st, 2003 here, we managed to get Article 23, a national security law shelved, and our last chief executive to “retire for medical reasons” (a face-saving gesture for him to step down). So there are definitely voices demanding for democracy, sometimes with some success, sometimes with less.
There are people holding the government accountable to corruption and are being harassed or arrested (e.g., parents demanding investigation into badly constructed schools with regards to the Sichuan earthquake—see here). So not every one is happy here, and for every person brave enough to speak out, they are applauded by many who wish they had the guts to do the same.
In some ways, I think the violence of self-censorship, of mass brainwashing is even more scary than the “mass violence” of Tiannamen you talk about. Certainly the effects are more far-reaching.