We often appeal to experts and authorities due to the usefulness of their acquired knowledge, and a lot of the time, this is a fairly sensible thing to do.
However, very often, I feel like there is a certain bias that is being introduced whenever one does so, and I am wondering whether this phenomenon has been deemed important enough to have been given a name.
Here's what I mean: an expert or an authority has chosen to be an expert or an authority. This choice implies an inherent bias that has lead them to take this particular path in life. Thus regardless of how much factual knowledge they acquire or how well they hone their instinct, this bias may possibly remain present in their mind and influence the way in which they transmit their expertise to others.
For example, imagine you wish to discuss Christianity with an expert. What sort of person becomes an expert in Christianity to begin with? Presumably all kinds of people, but I am sure if you pulled out the stats, you would see a remarkable number of Christians being experts in Christianity. Which isn't surprising, as their passion for their religion was what probably lead them to study it in detail to begin with. We thus might imagine a scenario where a critique of the Christian religion leads us to ask the help of an expert ... who happens to have a bias in favor of Christianity.
Likewise, imagine an expert in motor-racing. Presumably, many of these will be petrol heads (car enthusiasts), since their a-priori love for racing and vehicles was what lead them to become experts in this field in the first place. Imagine a scenario where there's a critique of the environmental impact of motor-racing, and we are lead to talk to these experts ... who happen to have a bias in favor of motor-racing.