I'm sure you've run across people who just seem to keep making really dumb mistakes. We even have phrases to describe them like "He's as dumb as a hoe" or "He'd tear up an anvil". Well now there is scientific evidence that this trait is a recognized characteristic. Back in my day, we had the "Peter Principle" which said that within any organization, people would be promoted to their level of incompetence. The situation where someone is unaware of their own incompetence is called the "Dunning - Kruger Effect". HERE is a link to some of their original research.
So, the next time you run across someone who seems to always make the wrong decision, you will be able to describe his condition.