I'm pretty convinced that if we hadn't had individuals with the natural confidence to take risks and lead other people, we would've never climbed down from the trees.
Some people develop these skills early. Some develop them with age. Some never develop them.
Having people with these abilities is necessary for progress. If you don't have authority, people won't do what you tell them to, and nothing is accomplished.
In other words, we can't get rid of the powerful people.