I reviewed your link--thanks, that was interesting.
Maybe we're in agreement. Let me try a more audacious assertion...
All I was saying was that practical demonstration or persuasion takes place within an unquestioned frame of reference. For purposes of the topic at hand, I would say, for example, that using the available evidence, I could convince 9 of 12 jurors under American rules of evidence and jury instructions applicable to civil trials, that Jesus of Nazareth was a flesh and blood historical figure. I think I could do this every week for a year and win 90% of the time. If we change the rules to "establish it beyond a reasonable doubt to 12 of 12 jurors", then my success rate goes way down, obviously.
(Of course, I am assuming that I make no intentional misrepresentations and call only expert witnesses with recognized technical qualifications and unimpeachable character. I.e., no "funny stuff".)
In other words, I am claiming to not be anywhere in the neighborhood of epsilon.
I'm almost entirely unconvinced (somewhat greater than epsilon) that's a useful measure - humans can be convinced of just about anything. But, an upvote for suggesting a measure. Still thinking of what I'd accept as a measure.
To break up the awkward silence at the start of a recent Overcoming Bias meetup, I asked everyone present to tell their rationalist origin story - a key event or fact that played a role in their first beginning to aspire to rationality. This worked surprisingly well (and I would recommend it for future meetups).
I think I've already told enough of my own origin story on Overcoming Bias: how I was digging in my parents' yard as a kid and found a tarnished silver amulet inscribed with Bayes's Theorem, and how I wore it to bed that night and dreamed of a woman in white, holding an ancient leather-bound book called Judgment Under Uncertainty: Heuristics and Biases (eds. D. Kahneman, P. Slovic, and A. Tversky, 1982)... but there's no need to go into that again.
So, seriously... how did you originally go down that road?
Added: For some odd reason, many of the commenters here seem to have had a single experience in common - namely, at some point, encountering Overcoming Bias... But I'm especially interested in what it takes to get the transition started - crossing the first divide. This would be very valuable knowledge if it can be generalized. If that did happen at OB, please try to specify what was the crucial "Aha!" insight (down to the specific post if possible).