Things like this happen in the US occasionally, but I've never seen such an onslaught like this even in the US. Violent outbreaks are extremely common in China, such as when workers rioted over firings, killing members of management. In fact, a Google search for "factory riot China" shows so many it boggles the mind.
What does this mean for China's rise as a global power? Well, if the people are so cavalier about killing each other, it does show a certain willingness to be aggressive in international politics. However, it also shows that, despite all the efforts of the government to create a "harmonious society," it is far from having done so.
I cannot fathom how a state with such rampant violence will be able to continue its march to the future. Yes, the US is violent, but this really shows a certain amount of common insanity that may even be spreading. My first impulse is to blame the repression of the state, but I can't say for sure. I would love to see any research that has been done in this area.