As with many things, this goes both ways. Some people are overconfident and need to practice humility. Other people are underconfident and need to take more risks. The trick is figuring which group you're in on any given day.
No. It goes one way more than the other. Did you read the article? Statistics the author references show that people are more overconfident than underconfident.
Drivers who assume themselves to be bad drivers tend to drive very little or not at all and never improve. They are parallelized by fear, their assumption they cant do anything rubs on others who are in car with them who then start to give them advice - making situation worst.
I have seen that dynamic a lot of times, because in my country it is quite frequent with women drivers. Not most women or something, but there is certain kind of woman who assumes own incapability and it is self-fullfiling prophecy.
https://www.polygon.com/2014/10/28/7083373/look-at-this-char...