Listen to the gatekeepers, but make up your own mind.

Will at Dispatches asks about discursive authority:

“Internet triumphalists tend to discount the value of cultural and scientific gatekeepers, and there’s some truth to their criticisms of filtering public discourse. But in a fragmented media environment, I’m genuinely disconcerted by the lack of visible authority figures. To add to the confusion, fringe individuals and institutions have become very adept at copying the aesthetics of mainstream organizations - witness the Discovery Institute’s glossy website, which lends an air of plausibility and scholarship to arguments that fall well outside the mainstream. To take a more extreme example, sophisticated Holocaust denialists are also very good at trotting out convincing facts and figures, styling themselves as legitimate historical revisionists rather than fringe cranks.

“So what do I do? How do I choose sides? I don’t have the scientific background to evaluate the Discovery Institute’s claims. I don’t have the time or resources to investigate the scope of Nazi genocide. In both cases, I defer to expert opinion, but now I’m less certain of my ability to distinguish between trustworthy figures and talented impostors. Instead of absolute deference to authority figures, I now rely on a vague sense of where the boundaries of acceptable discourse lie. So far, I’m not very happy with the results.”

I've believed for a while now that even though we protect freedom of speech, what we really want is moderated discourse. That's the only way that you can get anywhere. Mainstream science comprises an institution, the purpose of which is to systematically extend human knowledge of the natural world by moderating discourse between proponents of different hypotheses. As far as I can tell, the community of scientists is exemplary in its self-moderation of its internal discourse, almost always striking the right balance between giving a hearing to new ideas and deferring to established ones. It may make mistakes—it has in the past—but that is a peril of self-government. The balance doesn't always carry over to the outside world, where complex findings have to be reduced to blunt statements.

One suggestion for getting your bearings in any field: see if you can find a book by someone who is writing for sheer love of the subject rather than out of some desire to make an ideological point. Everybody's got an agenda, sure, but I think that a "disinterested" book can be a good way to get a decent impression of the state of the whole field. I can imagine that you could go wrong here, but it's probably a better place to start than the polemics. I'm thinking specifically of Richard Fortey's "Earth," which is the first and only full book about rocks that I've ever read. Fortey wrote it not out of any desire to prove the age of the earth, but to try to pass on his obvious joy in the history and practice of paleontology and geology. Could someone give a similarly “disinterested” account of creationism? It seems to me that creationism always has an axe to grind.

That a book is aloof from controversy doesn't guarantee that it is correct, but I think it's a start—it shows you where the gatekeepers are standing. As for challengers, I think one should give them an occasional hearing but not an equal platform. A “fair debate” for the Discovery Institute should be a panel of at least a dozen scientists, with laptops and reference materials, to the single DI rhetorician.

Want to challenge the gatekeepers? Let's slip back into MacIntyre-speak. You've either got to join the tradition and subvert it, or you've got to build an alternate tradition of discourse. In other words, you have to challenge the science from within the boundaries of an established discipline or you have to create a new discipline that earns its standing as a science. The latter option takes a significant amount of time. Despite some fitful attempts, creationists and Intelligent Design proponents haven't done this (and my guess is that they can't).