Because if you spend enough time on the internet, especially the Western side, you start to hear voices of people who oppose their governments and not enough from those who support it.
Even many who are supportive tend to say that their government is authoritarian.
For China, there's close to a 90% approval rating. Even liberal-approved sources admit that.
https://www.edelman.com/trust/2023/trust-barometer
https://news.harvard.edu/gazette/story/2020/07/long-term-survey-reveals-chinese-government-satisfaction/
https://americanaffairsjournal.org/2018/02/surprise-authoritarian-resilience-china/
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