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
The Duke Leto Atreides leaned ag