Unfortunately, I missed those replies. (In fact, I didn’t just miss them–I thought they didn’t exist. But I think at some point the old boards stopped alerting my email account to new posts in my threads so there may well have been replies after all.)
I’m not sure if that old thread will disappear when we get the new board going. I’m replying to this on the “boardtest” board. I’ll probably just leave it for now.
One typical left-wing / liberal slogan is, “Think global, act local.” The “global” transcends the national (i.e., patriotism and the flag), while the “local” is only a small picture, again ignoring the national level. People believing in this might fly a flag, but it’s not going to be a national flag.
I find it hard to watch videos at work, but that’s Hillary Clinton at the Democratic Convention. I’m not sure I’d chose her as a typical liberal, especially in that context. More typical of the liberal-conservative divide is the controversy about Senator Obama not wearing a flag pin, as contrasted with the conservatives who want an ant-flag-burning amendment.
I mentioned this here several years ago, but can’t find the post. At the time of 9-11, I was living in Orlando, and noticed that the bulk of “display patriotism” was in rednecky and lower-middle-class white neighborhoods; not just on houses, but on cars, trucks, styrofoam cups shoved into fences, and so on. Flag display was also common in middle-class but blue-collar neighborhoods; the types of places where nobody steps outside without first strapping a Nextel to their belt. These areas tended to be the most politically conservative. Flag display seemed inversely proportional to income among whites; in more affluent areas, hardly a flag was to be seen. In African-American neighborhoods, there were no flags. None that I saw, anyhow.
Well, since no one has attempted to answer the latter part of your question, I might as well take a stab.
George Lakoff, a professor of cognitive linguistics, has written many books about politics, where he often says that Republicans invoke strong-father authoritarian metaphors.
If you do some searches on the literature, you will find that there are many studies about actual psychological differences between liberals and conservatives. Flag-waving may be one of them, but that’s an awfully specific behavior that seems to fall in the category of authoritarianism.
Lakoff or Haidt’s are reasonable places to start, I’m sure you will find some interesting stuff. Come back and tell us what you found!