Why so violent

The anti-Japan protests in China are not only because of the history textbooks etcetera, but the Chinese Communist Party allows these anti-Japan protests as a methode for the population to let out their frustrations about the oppression, lack of human rights, corruption, injustice that is happening in China. It is also used to divert the attention of problems within China to other external issues.
That is why the Communist Party allows anti-Japan protests, but not anti-Communist Party protests.

out of personal experience, i can write the following:

during the cold war, for the germans, russia was the cause of all problems. america was good by all mean.

the problems like unemployment, crime etc. were all assigned to russia/east germany.

remarkable, there was james bond, but platoon was not known. when it occured to the cinemas, it changed people's opinion about america.

finally, germany reunited in 1990, and the trouble multiplied. now, one thing they see now, russia has affected them, BUT IS NOT AFFECTING THEM ANYMORE.

of course, the textbooks have changed. the idea of anti-russian protest is abhorrent.

alexriversan said:

during the cold war, for the germans, russia was the cause of all problems. america was good by all mean.

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There was a large (mostly left-wing, but also far-right) anti-US opposition, though. See esp. the "Double-Track" Decision on theatre nuclear forces.

the problems like unemployment, crime etc. were all assigned to russia/east germany.

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Can't really remember that unemployment or crime was ever blamed on the SU (surely not to a greater degree).

remarkable, there was james bond, but platoon was not known. when it occured to the cinemas, it changed people's opinion about america.

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In Germany?

finally, germany reunited in 1990, and the trouble multiplied. now, one thing they see now, russia has affected them, BUT IS NOT AFFECTING THEM ANYMORE.

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Actually, it's the other way round: nowadays many Germans perceive Russians as major players in the organised crime scene. East Europeans in general (Poles in particular) are seen as one of the reasons for high German unemployment numbers (which is only partly true, since many of them work in jobs no German would like to do).