Since violence is not a novelty and TV, relatively, is, TV cannot be responsible for the creation of violence. Our use and affinity for violence derives from its necessity. The survival instinct, the intense desire for self-preservation, leads, ultimately to greed for power. After all, power is, in essence, a state of very comfortable survival. Also, power serves to ensure survival for the future.
Violence is exercised as the most common mechanism for attaining power.
Anytime one can cripple his competition, or even eliminate his competitor, he gains more power. Thus, stemming from the oldest and most central instinct of man, violence is fundamental. In Heart of Darkness by Joseph Conrad, a journey along the rivers of Africa, the birthplace of all life, leads to a journey of the soul as well. The main character comes to the realization that the intrinsic nature of man is, indeed, a heart of darkness. Whether we admit it to ourselves consciously or not, violence is entertaining.