Sissela Bok - Mayhem: Violence as Public Entertainment (1998)
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As it does with so many other stimuli, the phenomenon known as 'habituation' also operates when it comes to violence. The greater the level of detachment and numbing, the more of the stimulus is needed to bring about what marketing strategists call 'arousal' and, in turn, to produce whatever pleasure the activity can bring.
Regardless of how often the appetite for entertainment violence becomes addictive, increased exposure does risk further desensitizing viewers. And the element of pleasure that they derive may lead them to regard violence as a more acceptable way of dealing with problems, and victimization as more tolerable so long as it befalls others, not themselves.