Let's not lose sight of the fact that some opinions are more valuable than others. To treat everyone's opinion equally is a fallacy. As a crude example, I would put far more value in the opinion of a heart specialist of 2013 than that of a barber of the 15th century when it came to my health. Likewise, some people are closer to the "Truth" than others in other areas. This is why logic, debate, and critical thinking are necessary tools of any Libertarian.
Orthodoxy, if it includes "believing something before applying reason" then yeah, that's not helpful to Liberty. But that doesn't mean that anyone's opinion is as valid as anyone else's.
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