But it's not that simple. There are many things like social dynamics at play whenever people interact with one another, and the one with most charisma is going to be a leader without a title–and that can be good too.
Neither regular management is. There's plenty of stories of failed management. At least if it's a whole team doing the management, toxic behavior by one individual can be controlled. If the toxic individual gets to be manager instead, then there's nothing to stop him.