Psychic Mediums vs Buddhist Monks

Who would have the better handle on how the true nature of reality is organised? For example what karma actually is and and how we discharge our obligations towards it; our free will in selecting a new incarnation. Logic dictates that the more insightful answers come from those who can communicate directly with the spirit world as psychic mediums can. The true role of the Buddhist Monk surely is to facilitate peace on Earth rather than to pontificate on the technicalities of the afterlife. This point by the way is not to denigrate the efforts of Buddhist monks, whom I have the greatest respect for.