Hugh Nibley notes that chief commander Moroni plays by the rules all the way through--he always wants to do the right thing. Here in Alma 55, Moroni's men
. . . went to the city Gid, while the Lamanites were in a deep sleep and drunken, and cast in weapons of war unto the prisoners insomuch that they were all armed . . . and all those things were done in a profound silence. But had they awakened the Lamanites, behold they were drunken and the Nephites could have slain them. But behold, this was not the desire of Moroni; he did not delight in murder or bloodshed, but he delighted in the saving of his people from destruction; and for this cause he might not bring upon him injustice, he would not fall upon the Lamanites and destroy them in their drunkenness. (Alma 55:16-19)
[Hugh W. Nibley, Teachings of the Book of Mormon, Semester 3, p. 173]