Artificial realities need not conform to physical reality any more than our homes mirror the outside environment. The images which are shown are, in many cases, as representative of socially constructed stereotypes as those on television. Subsequently, those who spend much of their time glaring at images on the screen take away a view of the world which is based more on what they see on the screen than on what they take away from actual physical contact with other people. Physical interactions thus become affected by the image-based interactions, creating a new reality for the participants. Additionally, the ability to change one's personality on the computer not only gives others an incorrect view of the world, but can easily intrude upon one's own psyche.
Violence is a common theme.
Extremely popular games, such as the Doom series, allow the player to jump into the life of a computer character, and enact a terrible price upon the minions of Hell. The visual graphics of Doom are from the point of view of the imaginary player and are quite realistic and graphic, even going so far as to turn the camera angle and show the characters death when it comes - death being the one thing a computer cannot simulate. Computers can be linked so that several people can cooperate with or fight against each other. Like television, a correlation between computer violence and real violence is debatable. However, if you've ever watched people playing Doom, they take the game very seriously, bodies jerking around in their chair, sweat on their foreheads, and anger in their eyes.