I think you are maybe also not thinking of the degrees of privacy people value.
For example, I used to have a job where it was valuable to be able to present to new professional acquaintances as politically neutral or at least politically agendaless. I have a very Google-able name. And Google really likes Facebook results. Therefore I kept anything publicly available, including on Facebook, fairly neutral—no tags in public contra pictures, for example. My bar was, if someone were to see they were going to meet with me, search my name, and read whatever struck their interest for a few minutes, they wouldn’t have significant information on my politics.
That’s a very different goal than keeping my information private from, say, the law.
I think you are maybe also not thinking of the degrees of privacy people value.
For example, I used to have a job where it was valuable to be able to present to new professional acquaintances as politically neutral or at least politically agendaless. I have a very Google-able name. And Google really likes Facebook results. Therefore I kept anything publicly available, including on Facebook, fairly neutral—no tags in public contra pictures, for example. My bar was, if someone were to see they were going to meet with me, search my name, and read whatever struck their interest for a few minutes, they wouldn’t have significant information on my politics.
That’s a very different goal than keeping my information private from, say, the law.