Do you understand the notion of PUBLIC and PRIVATE?
  1. What you do on internet is PUBLIC, visible to everyone. Anything on internet is virtual, it doesn't exist in the realm of the living. Any entity on internet is an avatar, a virtual identity separated from your physical living body.
  2. What you do in your home and in your real living life is PRIVATE. You cannot be a virtual identity in the same time as being a real living man.
If you draw a cat on a paper, you cannot say that the cat next to you is the same cat from that paper.
If you mix public with private, then you must be responsible for your own actions. Now come the question: do you want to be fully responsible for the actions of a virtual avatar on internet?
Privacy means when you separate public from private.