PBS Frontline Documentary The Mormons

I found a church history book at devins parents house that was really old and it had a whole chapter on it. It was basicly what you said except it seemed a little more to me like the indians had planned it out and told brigham young and he told them to do what they want but that the church members were to stay out of it. Shortly after that he got the messanger from cedar city and president young told him (the messanger) the same thing, except that they were to leave the imigrant trains un harmed unless it was self defence. and when the messanger got to ceadar city delivered the Prophets message they screamed in agony "its too late!" It then says that the indians planned the attack and anniciated it but once it had begun a group of brethren joined in. mostly out of fear and anxiety, how ever those men were still wrong and were held responsible by the church for the rest of their days, and God would be their judge. I believe that the members of the church and the Indains and any others who took part in that are all equally guilty. And that it is the same as if say the trolly square shooter was a member of the church or any other murderer. The church is perfect, but the members are not, and each member makes his and her own decisions.My actions are not president Hinkleys fault. Those are my views.

Thanks Tali, for your comment. Could you please cite the name of the book, year published and any documentary references about Brigham Young? I guess what I am looking for is the evidence that Brigham Young really did say that.