I guess it boils down to: if you live in a glass house, don’t throw stones
China being bad doesn't excuse the U.S, the U.S. being bad doesn't excuse China. But somehow, somewhere, in the rhetoric of HN (and let's face it, the internet) there's this idea that only the morally unimpeachable can criticize something. But in reality that just gives the worst actors carte blanche to do whatever the fuck they want - as long as it doesn't break some record or set a new standard for terribleness.
We're in a moral race to the bottom, and it doesn't help to say "because so-and-so did it." That just digs us deeper