So criticize their evidence and/or their logic, if you can. Don't whine or lament about their preconceptions.
This entire subtopic arose because Will made a clear appeal to authority, using Clark and Hansen. Appeals to authority can rightly be analyzed on the basis of problematic bias.
In other words, I wasn’t the one who opened the Pandora’s box.
http://www.fallacyfiles.org/authorit.htmlAn appeal to authority may be inappropriate in a couple of ways:
The authority is an expert, but is not disinterested. That is, the expert is biased towards one side of the issue, and his opinion is thereby untrustworthy.
For example, suppose that a medical scientist testifies that ambient cigarette smoke does not pose a hazard to the health of non-smokers exposed to it. Suppose, further, that it turns out that the scientist is an employee of a cigarette company. Clearly, the scientist has a powerful bias in favor of the position that he is taking which calls into question his objectivity.
There is an old saying: "A doctor who treats himself has a fool for a patient," and a similar version for attorneys: "A lawyer who defends himself has a fool for a client." Why should these be true if the doctor or lawyer is an expert on medicine or the law? The answer is that we are all biased in our own causes. A physician who tries to diagnose his own illness is more likely to make a mistake out of wishful thinking, or out of fear, than another physician would be.
While the authority is an expert, his opinion is unrepresentative of expert opinion on the subject.
The fact is that if one looks hard enough, it is possible to find an expert who supports virtually any position that one wishes to take. "Such is human perversity", to quote Lewis Carroll. This is a great boon for debaters, who can easily find expert opinion on their side of a question, whatever that side is, but it is confusing for those of us listening to debates and trying to form an opinion.
Experts are human beings, after all, and human beings err, even in their area of expertise. This is one reason why it is a good idea to get a second opinion about major medical matters, and even a third if the first two disagree. While most people understand the sense behind seeking a second opinion when their life or health is at stake, they are frequently willing to accept a single, unrepresentative opinion on other matters, especially when that opinion agrees with their own bias.
Bias (problem 3) is one source of unrepresentativeness. For instance, the opinions of cigarette company scientists tend to be unrepresentative of expert opinion on the health consequences of smoking because they are biased to minimize such consequences. For the general problem of judging the opinion of a population based upon a sample, see the Fallacy of Unrepresentative Sample.
To sum up these points in a positive manner, before relying upon expert opinion, go through the following checklist:
• Is this a matter which I can decide without appeal to expert opinion? If the answer is "yes", then do so. If "no", go to the next question:
• Is this a matter upon which expert opinion is available? If not, then your opinion will be as good as anyone else's. If so, proceed to the next question:
• Is the authority an expert on the matter? If not, then why listen? If so, go on:
• Is the authority biased towards one side? If so, the authority may be untrustworthy. At the very least, before accepting the authority's word seek a second, unbiased opinion. That is, go to the last question:
• Is the authority's opinion representative of expert opinion? If not, then find out what the expert consensus is and rely on that. If so, then you may rationally rely upon the authority's opinion.
If an argument to authority cannot pass these five tests, then it commits the fallacy of appeal to misleading authority.