It's seems that some trauma and events leave people with an inability to resolve the experience. Our minds seem to seek for an explanation for events that happen and their relationship to our existence. When one isn't able to create a story that “fits” past experiences disorder in the mind arises.
We can think about a society that is at least partially ignorant and chooses to remain so versus certain realities that only SOME individuals face.
Such individuals, needing a relationship to propriety in order to function well within in it, would be faced with an impossible situation of trying to resolve something that society will not acknowledge.
At the least a dualism arises.
I think our society approaches such duality with some complex solution that tries to resolve the duality.
This might be the insane approach.