Dilbert Principle - Why incompetent managers exist

I'm a fan of Dilbert comics since I was young, it is just fun to read comics and tease ourselves. One of the thereon, why incompetent managers exist, is given by Dilbert Principle

... the most ineffective workers are systematically moved to the place where they can do the least damage.

I am lucky enough that most of my superiors are competent people, and I learn a lot from them. As an electronics engineer, I learn how to design electrical power systems, understand mechanical design, and design process sequences. 

I do meet moron managers since this world is not perfect, it is never near or will be perfect at any time. Why do these people exist?

Darwin's theory of natural selection said

Individuals with adaptive traits—traits that give them some advantage—are more likely to survive and reproduce. 

By right, these people should be extinct, but they are on top of you.

So, if Darwin is right, they must have some advantage over you. 

Maybe morons are tempted to be luckier, or they can draw better "illusions" than you, or they just can drink more liquor than you.

Like it or not, they will exist around you. The Pareto rule said 80% of the job is done by 20% of the people. So you either choose to join the 80% moron, or you become the 20%. 

Happy working and happy coming holiday*.

*from not-so-happy boss.