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Evolutionary psychology is a long way from explaining all this with precision, but it is already shedding enough light to challenge some conventional wisdom. It suggests, for example, that the conservative nostalgia for the nuclear family of the 1950s is in some ways misguided--that the household of Ozzie and Harriet is hardly a "natural" and healthful living arrangement, especially for wives. Moreover, the bygone American life-styles that do look fairly natural in light of evolutionary psychology appear to have been eroded largely by capitalism--another challenge to conservative orthodoxy. Perhaps the biggest surprise from evolutionary psychology is its depiction of the "animal" in us. Freud, and various thinkers since, saw "civilization" as an oppressive force that thwarts basic animal urges such as lust and aggression, transmuting them into psychopathology. But evolutionary psychology suggests that a larger threat to mental health may be the way civilization thwarts civility. There is a kinder, gentler side of human nature, and it seems increasingly to be a victim of repression.
The exact series of social contexts that shaped the human mind over the past couple of million years is, of course, lost in the mists of prehistory. In trying to reconstruct the "ancestral environment," evolutionary psychologists analyze the nearest approximations available--the sort of technologically primitive societies that the Una bomber extols. The most prized examples are the various hunter-gatherer societies that anthropologists have studied this century, such as the Ainu of Japan, the !Kung San of southern Africa and the Ache of South America. Also valuable are societies with primitive agriculture in the few cases where--as with some Yanomamo villages in Venezuela--they lack the contaminating contact with moderners that reduces the anthropological value of some hunter-gatherer societies.
None of these societies is Nirvana. Indeed, the anthropological record provides little support for Jean-Jacques Rousseau's notion of the "noble savage" and rather more for Thomas Hobbes' assertion that life for our distant ancestors was "nasty, brutish, and short." The anthropologist Napoleon Chagnon has written of his first encounter with the Yanomamo: "The excitement of meeting my first Indians was almost unbearable as I duck-waddled through the low passage into the village clearing." Then "I looked up and gasped when I saw a dozen burly, naked, filthy, hideous men staring at us down the shafts of their drawn arrows!" It turned out that Chagnon "had arrived just after a serious fight. Seven women had been abducted the day before by a neighboring group, and the local men and their guests had just that morning recovered five of them in a brutal club fight." The men were vigilantly awaiting retaliation when Chagnon popped in for a chat.