Are you saying that the mistreatment LDS people suffered justifies their paranoia that outsiders would try to hurt them and therefore the actions they took preemptively to stop that from happening again?
I still think Juanita Brooks' books about Mountain Meadows and John D. Lee represent serious, professional scholarship. She was a member of the LDS Church, and lived in St. George, where after publishing her historical research the local Mormons ostracized her. But she stood by her facts nevertheless.
When Brigham Young received word, and a request for instruction on the standoff at Mountain Meadows, he sent word immediately "Let them go". But the horseback messenger got back too late.
The immigrants had poisoned wells along their way in Utah, some cattle and Indians had died or gotten sick from their mischief. They had mocked the Mormons along the way with provocative boasts about participating in Haun's Mill and other Missouri atrocities, and had boasted they were going to California to gather an army to come back and help the federal army that was marching on Utah with orders to kill the Mormons from President Buchanan. All Utah was in a panic of war, Salt Lake was being prepared for evacuation into the southern mountains near the Colorado river.
Juanita Brooks adduced evidence that suggested a local southern Utah Mormon leader gave the order to detain and kill the adult members of the wagon train. But the local Indians were also wanting to do that, and couldn't be persuaded otherwise. John D. Lee, who ultimately was blamed and tried and executed for it, had plead against the attack, but was overruled by the leader, the early head of the Hinckley Utah folks. The LDS leading families in Cedar City and Harmony were also on the side of killing. It was John D. Lee's pleading that got the children spared, and that fact was the first one to emerge that persuaded the national press and public that whites had been involved.
When a non-Mormon jury acquitted John D. Lee, the national press was outraged. There were calls for Brigham Young to be taken in and executed. In response to this, Brigham Young and other Mormons agreed that John D. Lee should be re-tried. . . . anyone ever hear of the Constitution bar against double jeopardy???? against people being tried more than once for a capital crime????---- and the non-LDS court personnel accommodated this unconstitutional re-trial. This time, a jury compose of only Mormons returned the guilty verdict.
Anyone with an ounce of fair mindedness would deal with the whole thing as in the context of actual declared war against the Mormons, and involving persons who were self-declared combatants in this war, and treat it as such. The anti-Mormon rhetoric is unjustified, as unjustified as the massacre of Mormon women and children at Haun's Mill was under the Missouri governor's declared "Extermination Order" which called for summarily killing all Mormons in the State of Missouri.
Some might criticize Brigham Young for his failure to stand up for John D. Lee, as John D. Lee did later in his "Confessions" book where he essentially became an anti-Mormon himself, but the plain fact is nobody could make peace for the Mormons, and it was John D. Lee whose blood the anti-Mormons were howling for.