The crucial word in the list is "fidelity," which indeed was not
enough to send Nostromo on this particular mission. Contrast it with the journey
in the Gulf, which was, in Nostromo's words, "a business where neither a
good eye, nor a steady hand, nor judgement are any use" and only "sheer
desperation will do," i.e., a heightened commitment to the ideal of fidelity.