Alma 55

 You can tell one of the righteous characteristics of Moroni was he did not seek revenge for - 

"...had they awakened the Lamanites, behold they were drunken and the Nephites could have slain them.

19 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 55:18–19)