Sorry I didn't see your question earlier, Astaroth. It would take quite a bit of print to answer it fully and I have gone over the essentials many times before so I'll try a shotgun approach:
You know the Zen saying: "When I begun on the path mountains were mountains but then mountains weren't mountains anymore but when I arrived mountains were mountains. Something like that.
This, I think, refers to the duality we perceive as existence that is really an illusion. When we think, we step out of time. Thinking as always about the past. It requires images and concepts we have learned. The direct original, garden of Edin, consciousness of man was the direct perception of reality, it's mirror in perfection. No separation from what is perceived. I am the universe without the I because there is only the perception without the presence of self. When we learn language, something that happened at least and probably well before 40 thousand years ago, we learned how to become insane, to identify with words and thoughts and to tie them to experience and identity. We found out that we could control each other by calling each other bad. There is nothing that is bad but there is pain and the withdrawal of love and support. Humanity, in total, became mentally ill, infected with the notion that man is evil. This occurred because we put our children down, withdrew our love and support of them if they didn't conform to the insanity of our dual way. We invented good and evil and the capacity to rationalize and excuse anything in the name of good. We taught each other that each is the worst in the world. The pain of this experience is complete and total, as painful as a human can feel pain. It was therefore deeply buried in consciousness because humans cannot survive with such conscious pain. We know it know only vaguely in depression or the feeling that something is incomplete, that there is something somewhere that is perfection. That perfection is the unity of state that comes with direct perception of reality without out thought, something we can no longer do except occasionally and with effort.
So yes, all of humanity is insane and there's no real need to change the definition. We can only just see it about the other and not about ourselves. We cannot easily permit ourselves to re-experience our pain. It has however been done on occasion been done.