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Dpar comments on Your Strength as a Rationalist - Less Wrong
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"This doesn't remotely follow and is far weaker evidence than other available sources. For a start, everyone knows that you get to Oz with tornadoes and concussions."
Let's not get bogged down in the specific procedure of getting to Oz. My point was that if you truly adapt merely seeing something written somewhere as your standard for evidence, you commit yourself to analyzing and weighing the merits of EVERYTHING you read about EVERYWHERE. Do you mean to tell that when you read a fairy tale you truly consider whether or not what's written there is true? That you don't just dismiss it offhand without giving it a second thought?
"It makes you look like an outsider who isn't able to follow simple social conventions and may have a tendency towards obstinacy. (Since you asked...)"
Like I said above to Vladimir, it's not a big deal, but you're reading quite a bit into a simple habit.
The fact that something is really written is true; whether it implies that the written statements themselves are true is a separate theoretical question. Yes, ideally you'd want to take into account everything you observe in order to form an accurate idea of future expected events (observable or not). Of course, it's not quite possible, but not for the want of motivation.
Well I didn't think I needed to clarify that I'm not questioning whether or not something that's written is really written. Of course, I'm questioning the truthfulness of the actual statement.
Or not so much it's truthfulness, but rather whether or not it can be considered evidence. Though I realize that you take issue with arguing over word definitions, to me the word evidence has certain meaning that goes beyond every random written sentence, whisper or rumor that you encounter.
The fact that something is written, or not written, is evidence about the way world is, and hence to some extent evidence about any hypothesis about the world. Whether it's strong evidence about a given hypothesis is a different question, and whether the statement written/not written is correct is yet another question.
(See also the links from this page.)
Around these parts, a claim that B is evidence for A is a taken to be equivalent to claiming that B is more probable if A is true than if not-A is true. Something can be negligible evidence without being strictly zero evidence, as in your example of a fairy story.