“Not everything that’s true is useful.” ~ Dallin Oaks, Reading Church History
“My duty as a member of the Council of the Twelve is to protect what is most unique about the LDS church, namely the authority of priesthood, testimony regarding the restoration of the gospel, and the divine mission of the Savior. Everything may be sacrificed in order to maintain the integrity of those essential facts. Thus, if Mormon Enigma reveals information that is detrimental to the reputation of Joseph Smith, then it is necessary to try to limit its influence and that of its authors.”
Dallin H. Oaks,
Apostle Dallin Oaks, footnote 28, Inside the Mind of Joseph Smith: Psychobiography and the Book of Mormon, Introduction p. xliii
According to one of your prophets, the truth may be sacrificed if it doesn’t help protect Joseph Smith and mormonism.
If someone is telling the truth about mormonism, you are justified in slandering them and lying about it to try to protect its reputation and limit the influence of the truth being told.