You guys are so full of it. You want to blame the guy who bought the equipment? It may sound easy to you, but trust me, I have helped soooooo many people setup computers that JUST DONT GET IT. I swear they really and truly cannot comprehend how a computer functions, let alone how a wireless router broadcasts or assigns IP addresses. The problem is not the owners, its the manufacturers. Unlike vehicles, where you have to show proficiency to be able to operate one, computers are sold to anyone with the cashola. A large percentage of them can barely use one to check email, let alone configure a wireless network for security. To them, a firewall is the brick in the back of the fireplace. Viruses are something you go to the doctor for, not download fixes for. Spyware is something off the Mission Impossible movie.
Until someone puts pressure on the industry to configure these setups as SECURE BY DEFAULT, there are going to be people taking advantage of the ones who buy the equipment and dont know how to set it up. Thats not an "attractive nuisance", its just a person who is in over his head.