Maybe… Just maybe… The media in the US is owned by capital, not the government. Profit based journalism is certainly different from government propaganda based journalism, no?
You’re right, the US government doesn’t give much of a fuck about public opinions so they don’t need to force the media to run only pro-government stories to stay afloat. The politicians are incentives to care more about their constituents than the country as a whole, and it functions, in a way.
If you want to talk about police brutality, the 1989 Tiananmen Square massacre wasn’t a China W. If you wanna go more recent, the Hong Kong resistance to CCP rule was a big inspiration to BLM.