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It's a little more complicated than that. If you were to draw an analogy to a courtroom setting, one question would be whether or not the person really qualified as an expert. In a courtroom setting, unlike a message board, the judge is forced to determine whether the person qualifies as an expert based on education, expertise, etc. before they testify. Then the jury would decide which expert to believe.

Even in a simple personal injury trial you might have treating physicians who qualify as experts and give their opinion, experts hired by the insurance who give their opinions, and a jury who decides who they believe on various issues.

Even if the person qualifies as an expert, they are still subject to the same rules as any other witness - bias, interest in the outcome of the case, and so on.

Even on these message boards where no rules apply, we sort of parrot those arguments when we have our endless arguments about the experts. I have in the past pointed out the hidden funding sources for many of the denial experts and tried to show how they can be turned into prostitutes by the denial industry with tactics perfected by Philip Morris and others here have tried to claim that the entire body of climate scientists that are measuring the impact of greenhouse gases on the atmosphere are doing it to get more research money (or whatever their argument is).

It has been obvious for roughly a decade that the regular combatants on this board are entrenched and only come here to convince each other with absolutely no possibility of that happening.

But...experts really can be invaluable because they do the math and they really can objectively use the peer review process to find errors and omissions, and they really can move forward and learn from the process while most of us are limited by our level of knowledge and have to figure it out as best we can.
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