The Tianmen Square protests are well known in the west (tank man is a very iconic picture known by basically everyone) contrary to your claim and if the sources on wikipedia are to be believed did not result in 10s of thousands of deaths (https://en.wikipedia.org/wiki/1989_Tiananmen_Square_protests...).
In general I think it is a constant struggle to keep society free from tyranny, and you should not torpedo that with comparisons with places that have it worse.
https://en.wikipedia.org/wiki/Violence_and_controversies_dur...
More recently, they are usually killed by right wing extremists who are unofficially sanctioned by government and often not prosecuted.
Big citation needed here. You'd be hard pressed to find any deaths here that weren't obvious, often video-documented cases of self-defense. Even then, the state has zealously prosecuted them, in Jake Gardner's case overriding the local prosecutor's determination that no crime had been committed and leading Gardner to suicide. Most ridiculous of them all, Kyle Rittenhouse is facing murder charges when every single one of his so-called victims is on video assaulting him.
Response to protests in China leads to people being crushed into literal chutney, and deaths in the 10s of thousands. That was the nature of deaths in tiananmen square, the photos of which often do not get shown in western media.[1]
[1] https://www.aboluowang.com/2008/0529/89034.html (Warning: NSFL/Gore/Human remains )
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The US has a lot to work on, but comparing it to China is a false equivalency.
edit: if this comment comes off as too emotionally charged/ visual, the mods can feel free to delete it.