That's just not very correct. There are no external errors in measuring probability, seeing as the unit and measure comes from internal processes. Errors in perceptions of reality and errors in evaluating the strength of an argument will invariably come from oneself, or alternatively from ambiguity in the argument itself (which would make it a worse argument anyway).

Intelligent people do make bad ideas seem more believable and stupid people do make good ideas seem less believable, but you can still expect the intelligent people to be right more often. Otherwise, what you're describing as intelligence... ain't. That doesn't mean you should believe something just because a smart person said it - just that you shouldn't believe it less.

It's going back to the entire reverse stupidity thing. Trying to make yourself unbiased by compensating in the opposite direction doesn't remove the bias - you're still adjusting from the baseline it's established.

On a similar note, I may just have given you an uncharitable reading and assumed you meant something you didn't. Such a misunderstanding won't adjust the truth of what I'm saying about what I'd be reading into your words, and it won't adjust the truth of what you were actually trying to say. Even if there's a bias on my part, it skews perception rather than reality.