Troubled about China

I start worrying when in countries with totalitarian governments like China we see demonstrations conducted with apparent government approval. Experience has taught me that there is invariably a reason not connected with what the demonstrators are complaining about. Hence my apprehension about the recent reports out of Beijing about crowds chanting anti-Japan slogans and surrounding the official car of the United States ambassador.
The fear must be that the Chinese rulers think a diversion from the country's economic problems is needed. If that is only half true then troubles are in store for Australia