The capacity to reason is superbly evolved in humans: multiple moon landings, the Magna Carta, a summer afternoon Negroni - all creatures of our highly developed cognitive and analytical powers. 

And, as it happens, supremely misleading in our estimation of our capacity to draw substantiated conclusions from data and even experience. We don't know what we don't know, and show little interest in discovering it, in general. 

Here's a great piece on why we can be so delusional, and three books to add to the list ...