What happens when you put a child in charge of their siblings? Sometimes nothing, but sometimes the evil comes out and as soon a the door clicks behind you the power goes to their head and they begin to rule over their siblings like an evil tyrant.
It is a sad statement of reality that such things have happened in the church through the ages. Men in positions of authority have abused their power. As much as it demonstrates the power of the sinful nature it demonstrates even more the overwhelming need for continued humility and intentional application of God's word.