When Willie Sutton was in prison, a priest who was trying to reform him asked him why he robbed banks. 'Well,' Sutton replied, 'that's where the money is.' There has been a failure to connect here, a failure of fit. Sutton and the priest are passing each other by ... Clearly there are different values and purposes shaping the question and answer. They take different things to be problematic or stand in need of explanation. For the priest, what stands in need of explanation is the decision to rob at all. He does not really care what. But for Sutton, that is the whole question. What is problematic is the choice of what to rob.

(Alan Garfinkel)

Despite the fact that questions and answers are, indeed, linguistic entities, "Why" questions involve as part of the conditions that make them answerable, or well-posed, a non-linguistic or extra-propositional aspect which is properly problematic: a distribution of the relevant and the irrelevant.

(Manuel De Landa)