"The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based." - Picard in "The First Duty" being sanctimonious. Picard ordered Data to lie in "Clues."; This just in: Starfleet is not a philosophy club. Starfleet is a space navy with different priorities than a philosophy club. Starfleet's purpose is to protect the Federation and its interests. That is where Starfleet officers duties are to be found. No one performed those duties better than Captain Benjamin Sisko.