Horrific tragedies have occurred in the US, like Kent State. But we know the truth about Kent State. We know the number of victims. It and similar events are included in our history textbooks. I know they are - that's how I learned about them! Tiananmen Square, we don't know the truth about. We don't know how many victims there were. The estimates range from hundreds to tens of thousands. And it certainly isn't included in history textbooks in China. It's likely one of the most fatal protest crackdowns in human history, but it is censored completely in the country where it occurred.
We're just descending into whatabout-ism at this point. The US has done plenty of horrific stuff. It shouldn't. We should be upset that it has. But that doesn't absolve China, and I don't think it's clear that they're even actually on similar footing.
Well if you think we should antagonize china for offending our freedoms, then we should be culling the nsa, fbi, and other 3 letter agencies that violate our constitutional right to privacy.
The US gov't and the chinese gov't are two faces on the same coin. The difference is the chinese gov't does what the US gov't does in the open.