Again, Crowther in his books and Joseph Heinerman in his three books (Spirit World Manifestations, Eternal Testimonies, and Temple Manifestations), keep recounting these ghostly or demonic temple manifestations as "faith-promoting" spiritual activity.
They don't provide guidance for discerning between hostile, malicious, malevolent spirits/demons and "ghosts." Even then, Deut. 18:9-12 says we should not be having contact with the dead, let alone being using Lds books, Lds Sunday School lessons, and BYU freshmen courses on genealogy to be encouraging people to seek out such experiences!
John Ankerberg and John Weldon quote Heinerman as claiming that these manifestations "detail scores of stories of dead family members and other spirits instructing Mormon leaders, missionaries, and laymen in genealogical and other Mormon work. In fact, these and other books reveal that for many Mormons, 'true' religion involves not only ministering to the spirits of the dead by proxy baptism, but also receiving guidance and instruction from spirits of the dead for spiritual growth. Heinerman explains, 'The inhabitants of the spirit world have received special permission to visit their mortal descendants and assist them and impress upon their minds the primary importance of assimilating genealogical information and performing vicarious ordinance work in the temples. Spirit world manifestations and angelic appearances have played and continue to play a major role in the upbuilding of God's Kingdom in these latter days...It should be gratifying to Latter-day Saints that those in the spirit world have expressed an intense interest in and are increasingly concerned with the activities of God's people on earth.'" (The Facts on the Mormon Church by John Ankerberg, John Weldon, & Dillon Burroughs 1991/2009 Harvest House Publishers, p. 72)
Lets take this one step further - the biblical prohibition against contacting the ‘dead’ is also basis against using such ‘contacts’ for the establishment of doctrine as well.