I'm a huge fan of Rory Sutherland. After watching this video, I think you'll see why.
“broadly speaking, something apparently very stupid and silly, which has been around for a million years or so, probably has some function to it.”
Rory argues that some things have no rational basis for existing but are nonetheless valuable. We can't explain why they work, but they do. He also explains that big problems don't always require complex solutions.
In a complex system, intelligence and rationality are not the same thing.