Knowledge gaps can be filled: https://www.ecchr.eu/en/publication/cia-extraordinary-rendit...

Yes, the quantity is different, the quality I'm not sure about. Are Chinese internment camps worse than Gitmo or Abu Ghraib?

The Chinese have apparently kidnapped people off the street as well, but not in Western states to my knowledge. That's different with the US, though maybe they haven't kidnapped anyone in China or Russia.