If you are an authoritarian state you don't give too much worry about that, if you grab the wrong person "oh well another day another murder."

It's about terror and control, not about justice. If you think that's bad wait till you see what the Khmer Rogue did in Cambodia. The precious framework of individual rights, a relatively functioning justice system, and constitutional guarantees may not be perfect here in the US of A, there are issues, and those rights are still being eroded, and we have work to do, but people who draw comparisons between places like the US and China or Iran clearly have no idea what they are talking about, and it's a decent chance they may in fact be part of state sponsored psychological warfare apparatuses.

There is no due process in authoritarian states. Being suspected by someone on the police that you might hold subversive views is enough to get you arrested, tortured, and murdered.