The list consists of signs that indicate when you might want to evaluate the basis of your opinions. It is not claimed that the list items, taken individually or collectively, are necessary or even sufficient for self-identifying your biases. The list does not say, "If your opinion does not much change after talking with more knowledgeable people, your opinion is reflective of your bias." Rather, it's merely that should you find yourself unswayed by seemingly knowledgeable people, some introspection may be in order: do you have a reason for disagreement beyond mere conviction?
"It is not claimed that the list items, taken individually or collectively, are necessary or even sufficient for self-identifying your biases."
So, basically, you're saying the list is useless. I agree with that. Or maybe we are to take its precepts as Zen koans, to be meditated upon despite their paradoxes?
I think your problem is in thinking that the list is intended to be a litmus test for opinions. For instance you said "much less accuse others who might reasonably differ on any of these points." which indicates that you want to be able to point to one of these items and tell someone they're wrong.
This list is just a starting point for you to question your own opinions. Of course it's subjective, I don't think introspection is ever intended to be objective. As a starting point for introspection the list is fine; as something you could ever apply to someone else you're right it's completely worthless.
Also, what paradoxes were there? In your first post you complained that the list was subjective (which it is) but now you're saying that it contains paradoxes without ever saying what those paradoxes are.
The author has stated as his main purpose the acquisition of truthful opinions, and avoiding delusion with groupthink and such. "Objectivity" is, I believe, the generally accepted name for such a pursuit; and introspection with such an object is a perfectly valid activity. Hence the main paradox of the article, which is that the author doesn't seem to have engaged in any form of such introspection before writing down these unstructured, and pretty much useless, musings.
No. Consider these as symptoms. A cough is neither necessary nor sufficient to prove you have a cold. You may have a cold without a cough; you may have a cough without a cold. Yet, you wouldn't assert that a cough is a useless piece of evidence when trying to diagnose an illness. Why then should you dismiss this list as useless just because it does not definitively answer a question for you?
No, actually, it is not, and you surely know this. People may be asymptomatic yet still have an illness. People may have all of the symptoms of a particular illness and yet not have it. And lists of symptoms are not (cannot truly be) exhaustive.
If such cases occur often enough, then the list of symptoms is not particularly useful. It can only have some use as a warning, if there are non-symptomatic tests available, but such is not the case here - you can't lab test your brain cells for the source of your opinions. What you seem to suggest is looking for more symptoms if you already experience some - but that "method" is flawed, and known as medical student's disease: http://en.wikipedia.org/wiki/Medical_students_disease .
In any case, if someone could reasonably check off all the items on the list, but be a very objective person; or respond to none of the items, and base his opinions entirely on groupthink; then I maintain my belief that the list is useless.
