Alma 21

 I just note the descendants of those rejecting the word as Aaron - 

"...began to expound these things unto them they were angry with him, and began to mock him; and they would not hear the words which he spake."  (Alma 21:10)

Yet as the people of righteous Lamoni heard the word as  - 

"...he caused that his people, or the people who were under his reign, should assemble themselves together.

21 And he did rejoice over them, and he did teach them many things. And he did also declare unto them that they were a people who were under him, and that they were a free people, that they were free from the oppressions of the king, his father; for that his father had granted unto him that he might reign over the people who were in the land of Ishmael, and in all the land round about.

22 And he also declared unto them that they might have the liberty of worshiping the Lord their God according to their desires, in whatsoever place they were in, if it were in the land which was under the reign of king Lamoni.

23 And Ammon did preach unto the people of king Lamoni; and it came to pass that he did teach them all things concerning things pertaining to righteousness. And he did exhort them daily, with all diligence; and they gave heed unto his word, and they were zealous for keeping the commandments of God."  (Alma 21:20–23)

I righteous leader can have a great effect on people.