Commentators often attempt to refute the nothing-to-hide argument by pointing to things people want to hide. But the problem with the nothing-to-hide argument is the underlying assumption that privacy is about hiding bad things. By accepting this assumption, we concede far too much ground and invite an unproductive discussion about information that people would very likely want to hide. As the computer-security specialist Schneier aptly notes, the nothing-to-hide argument stems from a faulty “premise that privacy is about hiding a wrong.” Surveillance, for example, can inhibit such lawful activities as free speech, free association, and other First Amendment rights essential for democracy.
Yet another problem with government gathering and use of personal data is distortion. Although personal information can reveal quite a lot about people’s personalities and activities, it often fails to reflect the whole person. It can paint a distorted picture, especially since records are reductive—they often capture information in a standardized format with many details omitted.
For example, suppose government officials learn that a person has bought a number of books on how to manufacture methamphetamine. That information makes them suspect that he’s building a meth lab. What is missing from the records is the full story: The person is writing a novel about a character who makes meth. When he bought the books, he didn’t consider how suspicious the purchase might appear to government officials, and his records didn’t reveal the reason for the purchases. Should he have to worry about government scrutiny of all his purchases and actions? Should he have to be concerned that he’ll wind up on a suspicious-persons list? Even if he isn’t doing anything wrong, he may want to keep his records away from government officials who might make faulty inferences from them. He might not want to have to worry about how everything he does will be perceived by officials nervously monitoring for criminal activity. He might not want to have a computer flag him as suspicious because he has an unusual pattern of behavior.
Of course, if this person had borrowed those books from his library, the government wouldn’t have been aware of it. ;) (Leaving aside the fact that books on making meth probably aren’t part of the typical library’s collection…)
I highly recommend reading this entire piece.