And yet authoritarian countries without such central ID have historically had to use other less targeted methods of oppression, which creates pushback and dissent within the population, leading to either the downfall of the government or intensive reforms. The threat of a “clean” system of oppression is that it will only catch actual dissidents, without sweeping in innocents. This could freeze out any chance of effective opposition.
The most effective 20th century totalitarian states, such as the East German DDR, issued ID numbers to its citizens, along with ID cards that citizens were required to carry at all times. This greatly helped the security services coordinate the oppression of suspected radicals, but without modern computer systems it relied too heavily on human efforts. It eventually faced its limits against rising dissent and it could not prevent the downfall of the government. A computerized Stasi would be much more terrifying.
One can look around the US today to see why this lack of ID may be a good thing. Immigration officials are facing serious roadblocks in rounding up and processing suspected undocumented immigrants, and mistakes in this process are creating widespread pushback. Protestors who take steps to mask their identity are not easily identified, apprehended, and prosecuted, which has led the administration to overreach in their reaction to dissent. And the lack of a unified system of oppression means that even targets of the state can often find ways to continue living in between the cracks, and they are not totally frozen out. In many ways it’s not a great system, certainly far from perfect, but the many flaws serve an important purpose in the face of systemic oppression. Inefficiency is an escape hatch.
If you live in a high trust society, you may not get it. The mutual animosity in the US is such that we have government officials talking about “national divorce” and otherwise average people joking about political murder. I know the UK is not quite as bad off, but I understand that it is quickly moving in that direction. That’s no time to introduce new potential mechanisms of oppression.