Isaac Mao believes theres not more to the anti-Japan protests  than just government manipulation:
Just in these two days, China gov tighten the control of internet to prevent from any callings on new protest. Yesterday, the spokesman of Minisry of Public Security warned that any online organizing or gossip on gathering are illegal. The official voices in these two days are mainly one point: all the people should keep stable as the first priority thing. It means that gov is worrying about the protest could evolve into anti-gov movement.
That's the myth in today's China. Gov wants to use civilian's protest to presssure on JP gov. They will also control the information to expose those only supportive to their policy and censor other opinions. Definitely, all the official media has been tamed to one tune already. They are trying a lot to do the same thing in cyberspace even with many so shortsight tricks. Anyway, it's obvious a mission impossible today, there rasied more reactions already in blogosphere(BBSs are totally controlled in these days), can be summaried into four types:
1. We common people can do nothing now, but only rely on gov
2. The gov is usefulless in solving the problem, they will eventually comprise and sacrifice people's benefit to keep their regime
3. The gov can do only limited things to reach real mutual understanding, the gap between people in the two countried will widen unavoidably
4. We won't trust the gov anymore, not just for this issue, many issues in this country are connected