Alma 48

There are some that believe that having a military defense and weapons leads to conflict more than peace. But Mormon teaches that the adversary and evil purposes will always be present. As Amalickiah was going about working his evil purposes through propaganda and deceit -

"...Moroni, on the other hand, had been preparing the minds of the people to be faithful unto the Lord their God.
8 Yea, he had been strengthening the armies of the Nephites, and erecting small forts, or places of resort; throwing up banks of earth round about to enclose his armies, and also building walls of stone to encircle them about, round about their cities and the borders of their lands; yea, all round about the land." (Book of Mormon | Alma 48:7 - 8)

"...thus he was preparing to support their liberty, their lands, their wives, and their children, and their peace, and that they might live unto the Lord their God, and that they might maintain that which was called by their enemies the cause of Christians." (Book of Mormon | Alma 48:10)

For -

"...the Nephites were taught to defend themselves against their enemies, even to the shedding of blood if it were necessary; yea, and they were also taught never to give an offense, yea, and never to raise the sword except it were against an enemy, except it were to preserve their lives.
15 And this was their faith, that by so doing God would prosper them in the land, or in other words, if they were faithful in keeping the commandments of God that he would prosper them in the land; yea, warn them to flee, or to prepare for war, according to their danger;

(Book of Mormon | Alma 48:14 - 15)

Mormon seemed to be inspired to warn and instruct us in our day. This would also apply to those the we choose to lead us for -

"...Moroni was a strong and a mighty man; he was a man of a perfect understanding; yea, a man that did not delight in bloodshed; a man whose soul did joy in the liberty and the freedom of his country, and his brethren from bondage and slavery;
12 Yea, a man whose heart did swell with thanksgiving to his God, for the many privileges and blessings which he bestowed upon his people; a man who did labor exceedingly for the welfare and safety of his people.
13 Yea, and he was a man who was firm in the faith of Christ, and he had sworn with an oath to defend his people, his rights, and his country, and his religion, even to the loss of his blood." (Book of Mormon | Alma 48:11 - 13)

You can sense Mormon's feelings of Moroni as he states -

"Yea, verily, verily I say unto you, if all men had been, and were, and ever would be, like unto Moroni, behold, the very powers of hell would have been shaken forever; yea, the devil would never have power over the hearts of the children of men.
18 Behold, he was a man like unto Ammon, the son of Mosiah, yea, and even the other sons of Mosiah, yea, and also Alma and his sons, for they were all men of God." (Book of Mormon | Alma 48:17 - 18)

There will always be men like Amalickiah. We always need prophets and men like Moroni to lead the faithful.