Were the Japanese released from that internment? Yes. Were they genocided? No. Were they stripped of their culture, heritage, social lives, and tortured for decades due to their beliefs? No. Does the US today recognize the Japanese internment as a moral crime? Yes.
That last one is a critical difference between cultures.
In China today you can't even discuss what's going on in Xinjiang.
You are of course lambasting the US, on a US website. Nothing bad will happen to you because of that. And in this thread you won't find thousands of bots attempting to say that the Japanese internment is ok, or otherwise justify that it should have happened; instead, most of the replies are fully agreeing that it was atrocious. Try that in China, see what happens.
Not only is it recognized as a moral crime, but the US government passed a law to give restitution to interned people. Does that clean the slate? No. Does that make it ok? No, of course not.
The point is not that the US is perfect or even good. The point is that the US system allows open discussion, criticism, protest, legislating, etc. It has built-in mechanisms to improve itself which it has done and continues to do.
China has none of that.
Is the US government less effectively repressive of dissent than the PRC? Sure. But it still does tend to violently repress dissent, especially when that is about conduct of policing or war.
Yes, the US has done bad things. And some of those bad things have been forgotten. But if you want to find out about them... the government is not going to prevent you from doing so. China is much worse in that regard.
You absolutely can, they openly put it on their own government websites and everything even. These measures are written into public law. All of this is behind some misleading language of course, but chinese people aren't stupid. People, especially in Xinjiang, being aware of what's going on is in fact beneficial to the government, as it serves as a warning to anyone who might resist in the future.
As a side node/regarding initial topic, I also really dislike the quick jump to "whataboutism" to try and kill off any form of discussion that draws parallels and comparisons with other countries (or, to anything else more generally). Because this is unfortunately how it mostly gets used today.