A failure of the Three Gorges Dam would bring China to its knees. They will likely start a war to distract, deflect and drive what remains of their economy.
Human life has no value to China’s rulers. Remember that it is a culture that has periodically burned its libraries and slaughtered its scholars.
Now they did this, why? to get hydro energy?
How many nukes would China need to match the output of Three Gorges?