Since we're on the repeat ourselves bandwagon: that is easy for most of us to say since we are technologically literate. Yet people who are literate in other senses don't always realize that.

Historically, they've seen their phone calls as private. Why should they expect their email to be anything but? Social networking sites (like Facebook) present themselves as groups of "friends". Why should people expect what they post to go beyond that group (unless a member of the group divulges it)? Some people realize that business transactions are recorded and may be sold to third parties (indeed, that's why a lot of people pay cash), but other people don't see that information being resold because they see the transaction as being closed when the the money and goods are handed over. Again, we know this isn't always the case but that is because we care enough about the technology, privacy, or whatever to seek out that knowledge. Other people care more about other things, so they don't seek out that knowledge (or even know that they should).

What you are talking about is common sense for people like us. It is not necessarily common sense to a teenager who doesn't know the ways of the world, nor is it common sense for the senior who knows the ways of the world in decades past. It is not common sense for a harried parent who knows everything about childrearing but little about business and technology. It is not common sense for the artist or writer who knows how to move people at an emotional level, but faulters when it comes down to understanding the world of numbers. Common sense depends far more upon your place in the world as it does upon the world itself. Please try to understand that because I don't entirely disagree with you. I simply disagree with the black-and-white terms with which you speak and I'm trying to see the world as the rich place that it is.