Nature always looks for the edge of chaos. Every ecosystem will tend to grow more complicated in a process which makes it more versatile and powerful but also more prone to instabilities.

The evolution of mankind works in much the same way. By increasing the thought space inside our minds nature makes us more capable of invention and innovation. But expanding thoughts leads to less and less solid ground to walk on.

As nature attempts to approach the edge of chaos sometimes accidents happen and the system is destabilized. This can also happen in our brains. The consequences may come in the form of ADD, mood disorders, autism, schizophrenia, hypersensitivity or maybe simply susceptibility to headaches and hey fever.

If you except leadership figures and statesmen I think you will be hard pressed to find any true genius who is not neurodiverse in some way.