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komponisto comments on Mainstream Epistemology for LessWrong, Part 1: Feldman on Evidentialism - Less Wrong
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Two points:
1) Have you read Gettier's paper "Is Justified True Belief Knowledge?"? I recommended it; it seems to create problems for the JTB analysis of knowledge even assuming a Bayesian understanding of "justified."
2) You're misunderstanding the purpose of "true" in the JTB definition. It's not a matter of assigning probability 1 to a proposition, it's a matter of the proposition actually being true. As Eliezer would say, don't confuse uncertainty in the map with uncertainty in the territory. Pick your favorite case of a scientific theory that was once well supported by the evidence, but turned out to be false. Back when available evidence supported it, did scientists know it was true?
As I argued in this comment from 2011, the intuitive reaction to the Gettier scenario is based on a probability-theoretic mistake analogous to the conjunction fallacy (you might call it the "disjunction fallacy").