All of the people in the wagon train were from Arkansas. If there were any Missourians in this train, they were not known to share the Arkansans' fate.
Contrary to what is stated by "Brigham Young" in the film, Joseph Smith never claimed to be a "god on Earth", nor did Brigham Young, nor were they considered such by any of their followers.
Bishop Samuelson has a flashback of his participation in the destruction of the Nauvoo Expositor. It is shown being torched as if by a mob, but in fact, it was the city council who ordered the newspaper destroyed and was done in a peaceable manner.