in my opinion, this is not pointed at the never mo press and public, it is aimed squarely at the membership as part of the feel good facade of the Smith family to make the members feel all warm and fuzzy about their illustrious leader.
Look towards the bottom of the the PR:
BALD. FACED. LIE.Smith died in Nauvoo, Illinois, 33 days after his brothers Joseph and Hyrum were killed by a mob in Carthage, Illinois.
“His death was caused by an illness contracted in his exertion to escape the mob while trying to go to the aid of Joseph and Hyrum,” Elder Ballard said. “So in many ways, Samuel was also a martyr.”
"an illness contracted in his exertion to escape the mob" WTF???? When are illnesses contracted from physical exertion? Ballard has no shame or spine.
What did Quinn find?:
Quinn argues that Willard Richards instructed Hosea Stout, a former Danite and police chief of Nauvoo, to poison Samuel Smith. He died not long after Joseph died.
While most of the church leaders were away from Nauvoo at the time, the church leadership quickly split along the lines of polygamy. Those who favored the continued practice of polygamy and secret ordinances were partial to Brigham Young, and wanted to wait until the Quorum of Twelve Apostles returned to Nauvoo before choosing a successor.
Those who were opposed to the practice of polygamy and secret ordinances favored the leadership of William Marks. Sidney Rigdon quickly made a proposal to become guardian of the church, and Marks threw his support behind Rigdon. However, the day before the meeting to decide whether Rigdon should be appointed guardian, the Apostles returned to Nauvoo.
Additional information from Deconstructor's website.
Just to emphasize the sappy part of the lie, designed to make the members even more committed to Smith, Ballard further redefines what a martyr is:
Elder Ballard wrote:“So in many ways, Samuel was also a martyr.”