The second type of privacy is "privacy of information." This is the ability to control who knows certain things. When we talk about computer programs and the Internet, this is the most common type of privacy we're talking about.
So why would somebody want privacy of information? Is it just because they're doing something that they want to hide from others? Is it just for committing crimes or for hiding harmful acts? Well, sometimes it is, yes. There are many people who use the concept of "privacy" to protect themselves from the law or the moral rejection of others. It is probably because of these individuals that the concept of privacy is a muddy subject – as long as it's unclear quite what "privacy" is, it's much easier for those who have committed harmful acts to invoke "privacy" as a defense.
But is that the only reason that somebody would want privacy of information? What about a normal person, who isn't doing anything harmful – would they ever want to keep certain...