It’s pretty easy nowadays to see the schizophrenic as completely incomprehensible. It would seem, that the modern world has almost no way to relate to the perceptual experience of madness.
But this was not always the case, communication with the schizophrenic was once possible, indeed, a regular part of life, and what was the result for civilization?
Well, in large part, we ended up with Holy Books; The Bible, the Quran, and nearly the entire Mythos of the ancient world. Now, it’s clearly debatable who wrote these books, but it’s nearly inconceivable to picture them existing without the experiences of schizophrenics.
Now, these books may be irrational, but we cannot say they are incomprehensible. They have their own sense to them, which can be followed and comprehended to some degree or another, and whether or not one agrees with them, it’s hard to say that they are without meaning.
Now some might say that this contribution to civilization did more harm than good, but it’s also hard to imagine living in a world without them. It would be a world almost devoid of cultural substance for thought.
Now, it could be that there is some cost to communicating with madness, perhaps rapid cultural change, or some sort of social instability. But I highly doubt it is the case that madness simply has nothing meaningful left to say.