The most dangerous thing in life is an incompetent that has been given a gun and a law enforcement badge.
Superficial knowledge is potentially more dangerous than ignorance. It gives a false sense of security encouraging an ignorant man to persevere in his efforts that can result in huge damage.
An incompetent person in a responsible position may cause huge damage. Such a person should act less and think more.
We are commanded by fools and incompetents.