The problem as I see it is that we are dealing with distinct paradigms. In the sanctification process, there appears to be a definite threshold point, a line we cross where our whole attitude and outlook changes: we get what I see as a deeper vision of truth, the growing ability to clearly discern soul from spirit, finite from eternal. Those who have yet to reach or cross that threshold, cannot possibly comprehend what lies on the other side.The changes in attitude and outlook of those who have crossed the line looks like apostasy or madness from the pre-threshold point of view, such as the attitude about mysticism from the conservative stance. 
Egoic needs (Certainty, Control, Safety) still hold way in First-Halfers; letting go of those needs seems the same as leaving the faith, for they have become so intertwined as to be indsitinguishable.