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It's worth mentioning that the Chinese have had the worst social unrest since perhaps the French revolution. The cultural revolution was a populist movement, pushed along by one man who had been sidelined in the government. Lots of people died, lots of great things were destroyed. Given that, it is kind of understandable that the Chinese are wary of avoiding popular unrest.
Please don't pretend you understand China. Cultural revolution was pushed by Mao, the Chairman of PRC who had never been sidelined by the government. The Communist Party manipulated unrest to get the whole country, and to further strengthen their administration they need to make sure all unrests are well under their control. Very often they plan and make use of "social" unrest to attack their enemies like the US and Japan.