2. This link is about what's happening in Hong Kong, not the US, and this sort of what-about-ism isn't informative or helpful.
People are (rightfully) outraged when a protestor dies in Hong Kong, but protestors also die in the US.
For example, the Kent State shootings: https://en.m.wikipedia.org/wiki/Kent_State_shootings
The point is that if you’re demanding a certain standard from China or other countries, you should demand that in the US as well.
"There was a significant national response to the shootings: hundreds of universities, colleges, and high schools closed throughout the United States due to a student strike of 4 million students,[10] and the event further affected public opinion, at an already socially contentious time, over the role of the United States in the Vietnam War."
Yes, America has serious, serious problems with police violence. But pointing out injustice does not necessitate bringing up every other similar instance of injustice. It is not helpful, and distracts from the issue at hand.