The document discusses several theories about the psychology and goals of aggressive behavior:
1) Aggressive behavior may serve a range of motivations including the desire to influence others, gain power over them, create an impression of toughness, or gain social approval or money.
2) Freud's theory was that humans have a "death instinct" that can be satisfied through aggression and destruction of others if not directed at oneself.
3) Some argue humans evolved an "aggressive instinct" that helped animals survive by fighting for resources and mates.
4) Konrad Lorenz proposed humans have an innate urge to attack that builds up over time like other instincts, and must be discharged through aggression or its displacement.