I live in Utah, and have heard about this type of stuff happening quite a bit in the LDS Temple...very creepy.
My thought is, these people are not seeing their dead relatives, but demons or some other such thing. The Bible seems to imply that the dead cannot reach us. Remember the Rich Man and Lazerus (sp)? The Rich Man wanted to go and reach his brothers to warn them about Hell, but was told that a “great casim (sp)” was fixed and he could not cross it to warn his brothers.
What makes the LDS Temple particularly creepy are all of the occultic sysmbols adorning the stone work and other parts of the exterior. They have inverted pentagrams, Saturn Stomes, Moon Stones, an All seeing eye, and on one wall, the Ursus Major “The Big Dipper” constellation. Yet not one symbol that’s associated with The Lord Jesus can be found: Cross, Fish, Lamb etc.
“The Bible seems to imply that the dead cannot reach us.”
Well, that certainly seems true, except when it isn’t (See Luke 9:28-36).
In Luke 9:32 Peter and other disciples saw two deceased, Moses and Elijah, standing with Jesus: “But Peter and they that were with him were heavy with sleep: and when they were awake, they saw his glory, and the two men that stood with him.”
Necromancers actively seek contact with spirits of the deceased, whereas Mormons going to the temple (or anywhere else) are not instructed to ever summon the spirits of the deceased. There’s a difference between actively trying to summon a spirit versus being passively aware of a spirit or angel that is appearing to you in a dream or vision.