Answer to Question 1
evolutionary (or ethological)
Answer to Question 2
(1) Symbolic models provide observers with the opportunity to acquire new techniques via observational learning.
(2) Observing violence that is permitted, condoned, or even rewarded promotes the belief that aggression is an appropriate way to deal with conflicts. Vicarious reinforcement increases the likelihood that viewers will use such tactics in their own actions.
(3) Repeated exposure to violence also desensitizes observers to the implications of human suffering. As people's reactions to violence are extinguished, being victimized and victimizing others become seen as an ordinary part of life.