Discipline
Whenever I start questioning the value of flight discipline I reach for "Flight Discipline" by Tony Kern (who also produced an insightful analysis of the "Bud" Holland disaster). This text should be prescribed reading for anyone in a management position in any industry and doubly so for those who value professional and rigorous standards of flying and adherence to standard procedures. I guess the loose cannons are useful in extremis (e.g. war time) but really have no place in the operational structures required to ensure safe commercial flight.