It is said that the Duke Leto blinded himself to the perils of Arrakis, that he
walked heedlessly into the pit. Would it not be more likely to suggest he had
lived so long in the presence of extreme danger he misjudged a change in its
intensity? Or is it possible he deliberately sacrificed himself that his son
might find a better life? All evidence indicates the Duke was a man not easily
hoodwinked.

-- from "Muad'Dib: Family Commentaries" by the Princess Irulan
--[dune]--