If you haven't seen this, its the best and most beautiful explanation for the "why" of privacy, and what it means for the practical definition of it.

I've never been able to put it into words myself, I scarce understood the totality of my own motivations and methods beyond what "felt right" for one reason or another. More than anything, this binds every one of those motivations into one.

https://media.ccc.de/v/38c3-feelings-are-facts-love-privacy-and-the-politics-of-intellectual-shame
By @Mer__edith at #38C3
President of the Signal Foundation and an Absolute Icon