If you were reading the comment I'm replying to and thinking to yourself "well, if you have nothing to hide, you have nothing to fear", let me ask you something.

When you go to the bathroom, do you close the door?

Do you think we should have security cameras in every public bathroom stall watching every man, woman, and child who does their business just to make sure nobody's doing drugs in there? (Criminalization of addiction is an entirely separate issue, but you get the point.)

No? You're worried about perverts watching the security tape?

Now you understand why we want online privacy.