This is a fairly long article and I have quoted from it liberally to summarize the main points, but you really should read the whole thing since it is spot on with respect to many key issues socially, politically and economically. There's a reason beyond rational disagreement. It also supports the cognitive work of George Lakoff concerning the differences between liberals' and conservatives' mindsets and attitudes that shape their opposing norms. Evolutionary biology suggests the reasons for thes differences arising in the evolutionary process, resulting in hereditary dispositional traits. While the science is somewhat speculative, I regard this a must read unless you want to sit down with the books that Chris Mooney draws upon.
Let’s begin with the large body of shared ground. Surveying the evidence with a fair mind, it is hard to deny that science is revealing a very inconvenient truth about left and right: long before they become members of different parties, liberals and conservatives appear to start out as different people....
The most rock-solid finding, simply because it has been shown so many times in so many different studies, is that liberals and conservatives have different personalities....
Several research groups have shown that compared with liberals, conservatives have a greater focus on negative stimuli or a “negativity bias”: they pay more attention to the alarming, the threatening, and the disgusting in life. In one experiment that captured this, Hibbing and his colleagues showed liberals and conservatives a series of collages, each comprised of a mixture of positive images (cute bunnies, smiling children) and negative ones (wounds, a person eating worms). Test subjects were fitted with eye-tracker devices that measured where they looked, and for how long. The results were stark: conservatives fixed their eyes on the negative images much more rapidly, and dwelled on them much longer, than did the liberals.AlterNet
Liberals and conservatives, conclude Hibbing et al., “experience and process different worlds.” No wonder, then, that they often cannot agree. These experiments suggest that conservatives actually do live in a world that is more scary and threatening, at least as they perceive it. Trying to argue them out of it is pointless and naive. It’s like trying to argue them out of their skin....
In this context, Hibbing and his colleagues consider a variety of potential explanations for the stubborn fact that there is large, politically relevant psychological and biological diversity among members of the human species, and ultimately settle on a tentative combination of two ideas. First, they assert, conservatism is probably more basic and fundamental, because it is more suited to a world in which life is “nasty, brutish, and short.” Being defensive, risk aversive, hierarchical, and tribal makes sense when the threats around you are very real and immediate. As many of these threats have relaxed in modern times, however, this may have unleashed more variability among the human species, simply because now we can afford it. Under this scenario, liberals are the Johnny-come-latelys to the politico-evolutionary pageant; the Enlightenment itself is less than 300 years old, less than an eyeblink in evolutionary time. “Liberalism may thus be viewed as an evolutionary luxury afforded by negative stimuli becoming less prevalent and deadly,” write Hibbing et al....
In other words, politics runs in families and is passed on to offspring. Hibbing and his coauthors suspect that what is ultimately being inherited is a set of core dispositions about how societies should resolve recurring problems: how to distribute resources (should we be individualistic or collectivist?); how to deal with outsiders and out-groups (are they threatening or enticing?); how to structure power relationships (should we be hierarchical or egalitarian?); and so on. These are, of course, problems that all human societies have had to grapple with; they are ancient. And inheriting a core disposition on how to resolve them would naturally predispose one to a variety of specific issue stances in a given political context.
All of which brings us to the really big question. It is difficult to believe that systematic psychological and biological differences between those who opt for the left and the right in different countries—differences that are likely reflected in the genetic code—arose purely by chance. And yet, providing an evolutionary explanation for what we see is fraught with peril: to put it bluntly, we weren’t there. We didn’t see it happen....
The answer, hints Tuschman in Our Political Nature, is that it may have been the liberals. For one core of the apparently universal left-right difference, he argues, is that the two groups pursue different reproductive strategies, different ways of ensuring offspring and fitness in the next generation.
And thus we enter the realm of full-blown, and inevitably highly controversial, evolutionary explanations. Tuschman doesn’t hold back. Conservatives, he suggests in one of three interrelated evolutionary accounts of the origins of politics, are a modern reflection of an evolutionary impulse that leads some of us to seek to control sexual reproduction and keep it within a relatively homogenous group. This naturally makes today’s conservatives more tribal and in-group oriented; if tribalism does anything, it makes it clear who you are and aren’t supposed to mate with.
Tuschman’s liberals, in contrast, are a modern reflection of an evolutionary impulse to take risks, and thereby pull in more genetic diversity through outbreeding. This naturally makes today’s liberals more exploratory and cosmopolitan, just as the personality tests always suggest. Ultimately, Tuschman bluntly writes, it all comes down to “different attitudes toward the transmission of DNA.” And if you want to set these two groups at absolute war with one another, all you need is something like the 1960s....
Returning to the present, Tuschman emphasizes that conservatives, and especially religious conservatives, always want to seem to control and restrict reproduction (and other sexual activities) more than liberals do. It’s understandably hard for an evolutionary biologist not to see behaviors that systematically affect patterns of reproduction in a Darwinian light.
And it’s not just reproductive patterns: Tuschman also suggests that other aspects of the liberal-conservative divide reflect other evolutionary challenges and differential strategies of responding to them. He traces different left-right views on hierarchy and equality to the structure of families (a move that cognitive linguist George Lakoff has in effect already made) and the effect of birth order on the personalities and political outlooks of siblings. And Tuschman traces more positive and negative (or, risk-aversive) views of human nature on the left and the right to different types of evolutionarily based altruism: altruism toward kin on the conservative side, and reciprocal altruism (which can be toward anyone) on the liberal side....
Why Right-Wingers Think the Way They Do: The Fascinating Psychological Origins of Political Ideology
Chris Mooney, The Washington Monthly
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