Desensitisation Theory
The desensitization theory infers that exposure to real-life and entertainment violence may alter cognitive, effective, and behavioral processes. These effects can over time develop into desensitization; a diminished cognitive, emotional behavioral response to a stimulus. For instance, the stimulus could a decrease in fear and sensitivity to extremely aggressive behavior and taboo subjects, and possible introduction to everyday life.
The theory suggests that constant exposure to such violence on a regular basis, no longer makes such a strong emotional impact upon the audience, possibly causing them to also be insensitive towards violence in everyday life. Implying children and adults are both becoming immune to the horror of violence, gradually accepting violence as a way to solve problems, imitate the violence they observe on TV and identify with characters.