Long story short.
B. Young, to various , 1855. "will no one rid me of this troublesome lawyer?"
Turns out, someone would.
B. Young, to various, 1857. "Will no one rid me of this troublesome wagon train?"
Surprise! Turns out, someone would. Mountain Meadows Massacre.
My GGGma's (Mary Ann Polly Bullock) second husband. Jesse Hartley.
He wasn't Mormon. Brigham Young denounced him publicly; said that he should have his throat cut; Jesse lit off for the territories; he ended up dead. Bill Hickman confessed to the killing. He was never punished.
It’s an interesting event, that parallels, in a small way, the much larger horrors perpetrated at Mountain Meadows a few years later. Brigham Young expressed distress at non-Mormons traversing Utah; they ended up dead. Their killers, save but for a token soul, went unpunished. There's no proof that he directly ordered the killing, I suspect he didn't. But, in such an atmosphere, is a direct order necessary?
It's all in the cover up.