>Of course when new
>evidence arrives, a rational person embraces it and discards old
>misconceptions that he might previously have relied upon, but that
>doesn't mean it was necessarily irrational to have relied upon them
Yes, it does. Accidents happen. Let's say I take the long way to school every day because I believe something good will happen if I do. After 7 years of walking to school the long way I find a $20 bill laying on the sidewalk. I could say it is because I held on to my irrational faith of walking the long way so it must be rational, but then I would be committing the post hoc fallacy.