Yes, the US is not as bad as China as a place to live (look at the migration flow between them for simple proof), but it's worth noting that the same way people explain away the US's flaws can be done in other countries as well.
http://www.sbs.com.au/news/article/2016/07/08/us-police-shoo...
And you say riots and police being hunted? There is violent unrest in China, too. In both the US and China, the middle-class and the folks in power just hand-wave away the concerns of the victimised demographics, finding excuses for the state's poor treatment of them.
As many people are mocking and blocking #blacklivesmatter as are supporting it. What are those in power actually doing in response to the upset demographics in the US? Hot air. Nada. Zilch. Zip. Nothing with any real bite. Hence, blase.
Seems to come up a lot when reminders of China being ruled by a totalitarian regime come along