What Dave has written is also what I have been taught. Runners must avoid being hit by a batted ball, even if the ball has passed all the infielders and no other infielder has a play on the ball. Runners are protected only when directly behind a fielder who misplays a ball, and I suspect it's the misplaying of the ball that protects them rather than the fact that they are behind a fielder.
One possible rationale for this interpretation is that the defense still has a right to make a play on a batted ball, even if that play will be made by an outfielder. Runners who make contact with batted balls thus hinder the defense's ability to play. The current interp is in line with a foundational idea of fairness that lies behind all the rules: let every player do his job. If the offense intentionally or negligently prevents the defense from doing its job, it should be penalized.
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Cheers,
mb
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