Prophecy will confirm and broaden the vision; it cannot create one if nothing is there. Vision is created through prayer, seeking God and sharing our hearts with people in the work. If these things are absent we need to be restoring people to God, not creating vision for empty hearts.
People who continue in blatant sin whilst exercising spiritual gifts create this ever widening gulf in their personality which results in spiritual failure, emotional collapse, sometimes mental breakdown, physical illness, relational difficulties and quite often a complete moral lapse.
It is easier for the leaders to reject the prophecy and the prophet, particularly if there are some unresolved character issues in the life of the prophet. It provides a legitimate reason to reject the word in the eyes of the people, though not necessarily in the eyes of the Lord. Prophecy has a way of testing our true motives.