You don't have to be a newbie to realize that p2p file sharing involves you seeing someone elses files. LOGIC dictates that if you can see their stuff, they MAY be able to see yours.

With all the concerns about privacy, viruses, copyright infringement, lawsuits, etc. anyone with common sense will learn more about what they are installing on their PC, either from websites or from friends who have tried it.

All you need to do is take a look at the shared directories option in your particular p2p software and make sure that your shared directory (and its subdirectories) contain nothing confidential or illegal.

If the user is not bright enough to figure out that sharing C:\ is probably not a good idea, then I'm amazed that they managed to figure out how to run a computer in the first place.

Don't blame the programmer for a user's lack of judgment.