Are germans idiots? Are Japanese idiots?
There's lots of examples of countries, with hindsight, starting idiotic wars.
China actually fits the template rather well. An authoritarian government, relying on economic growth and national pride for legitimacy. Then economic growth stalls and it has to rely more and more on tub thumping.
They were Empire Builders at one time: they thought it imperative to conquer and rule. But this description no longer applies to them. Nor does it apply to China, and history has proven it.
Now...does China intend to expand it's influence Globally? I believe so for a few reasons (I'll discuss two). One, there's the One-Belt-One-Road Strategic vision. This is a 40-50 year plan to build a trade network accros asia and the Indian Ocean to the Med and to Europe. It includes railways, ports, industrial centers, new cities, universities and even a blue-water navy to protect the shipping routes.
Two, there is the AIIB - the Asian Infrastructure Investment Bank: the first real challenger to International Finance that the World Bank and IMF (basically American Institutions) have ever seen. The AIIB has the money, the leadership, the participation and the patience to make it a success. Plus, unlike the IMF and the World Bank, they do not tell other countries how to run their economies and politics.
The One-Belt-One-Road Initiative and the AIIB give China an Asian vision, a unified, long-term plan and, hence, an advantage. They should start bearing fruit within the next 10-20 years. And if this seems like a long time, then so? China is in it for the long run - this is a 4000 year-old culture that thinks very-long term. This is a culture that was peaking before Rome....was Rome Greece...was Greece, or even Israel...was.
Last, China has taken a few initiatives in South America and had definetley taken initiatives in Africa. China has built universities, railways and ports in Africa and intends to get raw materials from Africa but also gain a new market for their goods. Meanwhile, South America is....South America. Making headway with these guys is like trying to push a rope...but if anyone is patient enough to do it, then I'd figure it was the Chinese.
Now...none of this is indicative of a country that intends to project hard power into other people's affairs. In fact, it looks like China is trying to becomes the world's trading partner, not it's military master.