I agree with this comment, but now I'm not sure what you were trying to get at in the original post.

(I'll focus on just the first paragraph.)

If Miss Frizzle could do it, why couldn't we? Do we really have to be rational all the time in order to teach rationality?breaking the rules of reality within the realm of a work of fiction and making the protagonists (or the audience if it's a videogame) figure the new rules out for themselves... Actually now that I think of it videogamers are very used to adapting themselves to entirely new sets of physics on a weekly basis... but no-one has ever made them stop and think about it for a while, AFAIK.

I read something along the lines of this:

Counter to first intuition, telling stories set in a world whose natural laws differ from those of our own may sometimes be useful to the purpose of teaching worthwhile facts and skills.

I don't see that this has anything to do with decision theory, so I wouldn't have used the word "rational" to say it.