It has recently come to my attention that people are being damaged, their lives perhaps ruined, by epiphanies occurring at meditation camps. This does not surprise me. There are those teaching meditation for whom enlightenment remains a fairytale. They know and can teach the mechanics of meditation but are ill-equipped to deal with it's fruits. They have a secular understanding of enlightenment and fail to recognize that the sweeping away of one's illusions without preparation must all but inevitably be devastating.
The smashing of illusions can happen in many ways. As a combat veteran it seems to me that what shows up as PTSD is often that one's illusions have been smashed to powder, and no amount therapy could reassemble that powder into a functioning illusion in a million years. All therapeutic attempts at the reconstruction of the former state just lead to further hopelessness and despair because the impossible can not be done: once an illusion has had it's cover blown its over for the little man behind the screen. No amount of encouragement or medication can put things back the way they were, and something radically real must enter into life if life is to ever find meaning again.
Most people leading normal lives are in no danger of enlightenment. They can go to a meditation retreat without fear or hesitation of any kind. They will learn what the teacher has to teach and do as the instructor instructs and they will get something out of it. But there are those (with the right push) who without knowing it are capable of a dramatic transformation. These are human beings in whom, for what ever reason, the necessary elements exist for the dropping of the veil; and once dropped the veil is irretrievably gone. The illusions which sustained them in their day to day lives have been beneficently smashed. What now?
Meditation practices that we have today come to us from ancient religious traditions which had (and have) an intact philosophical matrix. To pluck the practice of cultivation of awareness from it's ancient estuary without drinking the water is like unto courting the curse of the Buddha's ruby. You may get more than you bargained for. Enlightenment is like a loaded gun. It's not for those without some formal knowledge. Truth is not a pathless land, but to be turned out into the land of Truth without guide or map or compass can destroy the personality leaving just a raw nerve.
The Atlantic Ocean blows up mists that ingulf the British moors, and weeks go by where one will see neither sun nor stars. The land is all but featureless and in legends of old we find tales of gnomes offering to guide travelers across the moor, only to leave them to perish in that vast vagueness.
Separating meditation from the dangers of enlightenment can not be done, but the unenlightened will teach meditation.