I find George Lakoff's analysis to be right on the mark.
Here's his book about this concept:
Moral Politics: How Liberals and Conservatives ThinkAnd here's an informative interview with the author from TOMPAINE.COM:
http://www.tompaine.com/feature2.cfm/ID/7747TomPaine.com: When your book Moral Politics was first published in 1996, its subtitle was "What Conservatives Know that Liberals Don’t." In its latest edition, the subtitle is "How Liberals and Conservatives Think." Whether you’re focused on what they know, or how they think, your thesis is that both parties operate from a model of the family.
George Lakoff: Yes, all Americans have the basic metaphor of the nation as family, where we have Founding Fathers, and we send our sons and daughters to war, and so on.
And politics is connected with the family via this metaphor, and connected very, very deeply. There are two different ideal models of the family that I'll call a Strict Father Family and a Nurturing Parent Family.... And this metaphor maps those models of the family onto our national moral and political life. And what you get are two very, very different models of the family, and with them two very, very different models of politics.
Here’s how those differences play out. If you have the Strict Father models of the family then you’re assuming that the world is a difficult place and always will be, that children are born bad and have to be made good, that the job of the father is to be a moral authority, to protect the family, to support the family.... <snip>
On the progressive parents’ side, the idea of a nurturing family is very, very different. There it is assumed that the world should become a nurturing place, should become a safe place, a healthy place. And that children are born good and should be kept that way and developed. That the idea of a parent is to nurture children, and to raise children to be nurturers as well....
This implies many things.... First a nurturant parent has to be fair, promote fairness. You’re not empathetic toward someone if you’re not fair with them.... Protection is an important value. Think of the things that nurturing parents want to protect their children from, not just crime and drugs but also cars without seat belts, tobacco, chemicals in the environment, unscrupulous businesses, namely all the things that liberals would like the government to protect citizens from. (much more...)
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Imho, Lakoff makes total sense...
sw