You have to understand that Mormons base their view of truth on feelings, not facts. Facts can stare them straight in the face but if it makes them feel bad or uncomfortable they consider it untrue. They do not look at spiritual things with an objective mind but rather base their spiritual knowledge, or epistemology, on how it makes them feel.
The biggest hurdle in getting people out of Mormonism, is making them look at facts and think for themselves rather than just feel.
You have to understand that Mormons base their view of truth on feelings, not facts.