Why China Can Never Attack Taiwan

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The distance to the Three Gorges Dam is 900km by missile,
It would take only 10 minutes for the dam to collapse.
The actual Hsiung Feng missiles have a range of 1,200km.
Hundreds of them are deployed for combat.
What would be the result if they were struck?
As shown in this video, 100 million people in the lower reaches of the Yangtze River would be submerged like that.
Not only Yichang and Wuhan, but even Nanjing, with 10 million people, would be flooded under 5 meters of water.
Would Xi Jinping attack, risking the deaths of 100 million people?
If so, there is no helping it.