Liang1a said:
Why does China needs to respond to foreign aggression and can never take the initiative to do what it should do anyway?
Why doesn't China take the initiative and become aggressive?
On AsiaWind, Liang asked an excellent question. Why doesn't China have a pro-active foreign policy and throw its weight around?
We can only conclude that China has conducted an analysis and found a pro-active foreign policy to be sub-optimal.
Look at the prime examples of an aggressive foreign policy.
One example is the United States. The US is mired in Afghanistan, Iraq, and Syria. There is no way out. The US is bleeding tons of cash. By some estimates (if you include treatment of wounded veterans over their lifetime), the recent wars have cost the US about three trillion dollars.[1]
Another good example is Russia. Subsidizing Abkhazia, South Ossetia, Crimea, and eastern Ukraine is bleeding the Russians dry. The Russian foreign exchange reserve has fallen from $550 billion to $350 billion. It's still dropping.
Imagine if the US had tried its best to avoid wars. There would be trillions of dollars circulating through the US economy. With the multiplier effect, US automation, businesses, technology, and wealth would multiply at an incredible rate. Instead, the US economy is in a deep funk. The US economy is growing only $600 billion annually. In contrast, China is consistently growing about $1,000 billion per year.
China is installing more industrial robots per year than the US. By staying out of a war, China can keep deploying its peace dividend to turbo-charge its economy and scientific advancement. China is scheduled to start building the world's largest super-collider in 2020. In comparison, the US Congress canceled the Texas SSC (ie. super-conducting super collider) in the 1980s.
China's goal is to build the most prosperous and technologically-advanced nation in the world. By adhering to a peaceful foreign policy, China will become the undisputed world power. It's already happening. It will take a lot more than a few American naval ships sailing in the South China Sea to change China's strategy of a peaceful foreign policy.
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Reference.
1. Source (The Washington Post):
The true cost of the Iraq war: $3 trillion and beyond