The Mormons tried to take over the whole state through violent rebellion, therefore there was an Execute-On-Sight order put on all Mormons in Missouri.

Actually, the Latter-day Saints legally bought property throughout Missouri and even founded a few towns, but their neighbors didn't like their political and economic influence and formed mobs to kill them and steal their land. The Latter-day Saints were unable to get support from the corrupt Missouri government, and states rights being a major issue of the time, were also unable to get support from the federal government. They defended themselves with deadly force, but were unable to prevail against the mobs, which were explicitly supported by the state. The "Extermination Order" was eventually signed by Governor Lilburn Boggs, and the Latter-day Saints abandoned their legal property in Missouri.

So no, there was no violent rebellion of "Mormons" in Missouri. There was a state-sponsored genocide, which eventually forced an entire faith to flee the United States in search of religious freedom. One of the darkest moments in our country's history.