Pretty sure that's an outrageous exercise in false equivalence. What's happening in Portland isn't right, but it is an aberration, and it will be stopped. Nobody has "disappeared."
What is the mechanism for redressing grievances like this in China, exactly?
Sure, let’s point to a single, or two, case in one city in the US, in which case the DHS is being sued last I checked, to contrast a ground up system in the whole of China.
Just today, or yesterday, a respected prof got fired from Tsinghua for being critical of CCP and Xi in particular.