There's an implied risk, and required training, with driving. In order to be allowed to drive, one must take appropriate training and get a license. This tells potential drivers that there are things they need to learn before they can get behind the wheel.
In the computing world, there really isn't any such thing, especially for the home user. Joe Average can just go out to Best Buy, purchase a computer, take it home, and be online. He can, and probably will, very quickly get infected with all sorts of malware and his computer may start attacking systems all over the Internet without Joe Average's knowledge - He was never told.
Perhaps there should be a license (and training) required for Internet access similarly to what is required for driving. Maybe even throw in annual inspections of the licensee's computer for good measure.
Of course then there's the whole privacy issue...