Mean world syndrome is a term coined by George Gerbner to describe a phenomenon whereby violence-related content of mass media makes viewers believe that the world is more dangerous than it actually is. Mean world syndrome is one of the main conclusions of cultivation theory. Gerbner, a pioneer researcher on the effects of television on society, argued that people who watch television tended to think of the world as an intimidating and unforgiving place. A direct correlation between the amount of television one watches and the amount of fear one harbors about the world has been proven, although the direction of causality remains debatable in that persons fearful of the world may be more likely to retreat from it and in turn spend more time in indoor, solitary activity such as television watching.
Source: Ultra Facts