[thingification]

Where to draw the line? How about "people you have seen"? But the line is less important than the reason for the line being where it is -- and that is about things like the principle of least authority, stability against tyrrany, whether progress is held back even a little by chilling effects, etc.

It isn't necessary to restrict others ability to see, know or remember per se, but only to prohibit the application of those powers -- by means of large computer databases collected by many people -- to particular purposes. In exactly the same sense, it isn't necessary to constrain people's ability to move their arms and hands in order to prohibit strangulation.

Perhaps your dilemma is caused by something along the lines of a tacit incorrect assumption that moral principles are not constrained by other moral principles. Can you think of a moral principle about freedoms that is not restricted in any way by harm caused to others and to society?

I think you are right to say that "it just feels unnatural" is not a good argument, but I don't think that's because you are arguing with the majority: the majority are often wrong.