Nephite Motivations for War Were Righteous
Alma 43:9–10, 23, 28, 30
9 And now the design of the Nephites was to support their lands, and their houses, and their wives, and their children, that they might preserve them from the hands of their enemies; and also that they might preserve their rights and their privileges, yea, and also their liberty, that they might worship God according to their desires.
10 For they knew that if they should fall into the hands of the Lamanites, that whosoever should worship God in spirit and in truth, the true and the living God, the Lamanites would destroy. . . .
23 But it came to pass, as soon as they had departed into the wilderness Moroni sent spies into the wilderness to watch their camp; and Moroni, also, knowing of the prophecies of Alma, sent certain men unto him, desiring him that he should inquire of the Lord whither the armies of the Nephites should go to defend themselves against the Lamanites. . . .
28 And Moroni placed spies round about, that he might know when the camp of the Lamanites should come. . . .
30 And he also knowing that it was the only desire of the Nephites to preserve their lands, and their liberty, and their church, therefore he thought it no sin that he should defend them by stratagem; therefore, he found by his spies which course the Lamanites were to take.
Elder Bruce R. McConkie wrote:
“Self-defense is as justifiable where war is concerned as where one man seeks to take the life of another. . . . Righteous men are entitled, expected, and obligated to defend themselves; they must engage in battle when there is no other way to preserve their rights and freedoms and to protect their families, homes, land, and the truths of salvation which they have espoused.”
(Mormon Doctrine, 2nd ed. [1966], 826.)