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"On Killing II: The Psychological Cost of Learning to Kill"

A Resistance to Killing

To truly understand the nature of aggression and violence on the battlefield we must first recognize that most participants in close combat are literally “frightened out of their wits.” Once the bullets start flying, and combatants slam head on into the “universal human phobia,” they stop thinking with the forebrain (that portion of the brain which makes us human) and start thinking with the midbrain (the primitive portion of our brain which is indistinguishable from that of an animal).

In conflict situations this primitive, midbrain processing can be observed in the existence of a powerful resistance to killing one’s own kind. Animals with antlers and horns slam together in a relatively harmless head-to-head fashion, and piranha fight their own kind with flicks of the tail, but against any other species these creatures unleash their horns and teeth without restraint. This is an essential survival mechanism which prevents a species from destroying itself during territorial and mating rituals.

One major modern revelation in the field of military psychology is the observation that this resistance to killing one’s own species is also a key factor in human combat. Brigadier General S.L.A. Marshall first observed this during his work as the Official U.S. Historian of the European Theater of Operations in World War II. Based on his post-combat interviews, Marshall concluded in his book, Men Against Fire, (1946, 1978), that only 15 to 20 percent of the individual riflemen in World War II fired their weapons at an exposed enemy soldier. Key weapons, such as a flame thrower, usually fired. Crew served weapons, such as a machine gun, almost always fired. And firing would increase greatly if a nearby leader demanded that the soldier fire. But, when left to their own devices, the great majority of individual combatants throughout history appear to have been unable or unwilling to kill.

Marshall’s findings have been somewhat controversial. Faced with scholarly concern about a researcher’s methodology and conclusions, the scientific method involves replicating the research. In Marshall’s case, every available, parallel, scholarly study validates his basic findings. Ardant du Picq’s surveys of French officers in the 1860s and his observations on ancient battles (Battle Studies, 1946), Keegan and Holmes’ numerous accounts of ineffectual firing throughout history (Soldiers, 1985), Richard Holmes’ assessment of Argentine firing rates in the Falklands War (Acts of War, 1985), Paddy Griffith’s data on the extraordinarily low killing rate among Napoleonic and American Civil War regiments (Battle Tactics of the American Civil War, 1989), the British Army’s laser reenactments of historical battles, the FBI’s studies of non-firing rates among law enforcement officers in the 1950s and 1960s, and countless other individual and anecdotal observations, all confirm Marshall’s fundamental conclusion that human beings are not, by nature, killers. Indeed, from a psychological perspective, the history of warfare can be viewed as a series of successively more effective tactical and mechanical mechanisms to enable or force combatants to overcome their resistance to killing.

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