The killer instinct is the ability within a person to take the life of an animal or another human being without the psychological inhibition normally associated with taking life. Psychologists generally accept approximately 2% of individuals have a killer instinct, or formally psychopathy; other analysts question whether it can be taught (for example, through military training and/or after societal breakdown). Some argue that while the mechanical action of killing can be taught, the actual instinct to do so remains inborn or can only be brought out through severe abuse.
It is generally accepted that some humans possess an ability to kill another human in order to achieve a goal. One example is soldiers; soldiers commonly report that in combat, it is simplistic to determine which of their comrades "genuinely wish to kill" and which "are merely serving their time." Posture, walking behavior, attitudes towards the battle can be seen on both an preconscious and fully conscious level, with natural killers in a fire team actively seeking out opportunities to end the life of enemy combatants, while careerists seek out safe and/or supportive roles.
More generally the term killer instinct is used as a hyperbolic idiom for ruthlessness and determination, for example in business and sports commentary, and as a synonym for "finishing touch" when writing about soccer, without a real indication that someone is willing to transgress the taboo of taking a human life.
Famous quotes containing the words killer and/or instinct:
“When a man’s partner’s killed, he’s supposed to do something about it. It doesn’t make any difference what you thought of him, he was your partner and you’re supposed to do something about it. As it happens, we’re in the detective business; well, when one of your organization gets killed, it’s, it’s bad business to let the killer get away with it. Bad all around. Bad for every detective everywhere.”
—John Huston (1906–1987)
“The animals that depend on instinct have an inherent knowledge of the laws of economics and of how to apply them; Man, with his powers of reason, has reduced economics to the level of a farce which is at once funnier and more tragic than Tobacco Road.”
—James Thurber (1894–1961)