In such a large population, there are bound to be people that don't share our values and behavioral expectations. Networks were designed and built from the ground up to provide accessibility and communications. Unfortunately, that means that we're accessible to some people we'd rather not be. We've created a relatively free society on the Internet. Everyone can travel virtually anywhere in the world.
Most people have desktops that can be programmed to say or do almost anything.
That environment demands cooperation from the networked citizens for order to be maintained. Without that cooperation, a single individual can cause us problems just as they can in real life by traveling down the Interstate in the wrong direction, breaking store windows, or stealing letters from our mailboxes. Today's complex computers and the rapid implementation of new applications results in a situation where our technical environment isn't as strong as it would be if things were moving more slowly or we weren't asking our computers to do so many things. The tasks assigned to a computer vary with the imagination of the programmer and hardware designer. Few things we use everyday are as versatile.