You're sitting on the couch, playing a video game. Press the button on your console and you're shooting a gun. Keep on pulling the trigger and anonymous digital bodies explode and vanish on the screen before you. You're extinguishing so many you can barely keep count. Video games, gory films, graphic images on the Internet -- much of the violent content we consume, whether for entertainment or information, is associated with effects of dehumanization, an unfeeling response in the wake of cruelty.