I imagine that phenomenon is similar to how super sheltered kids become the wildest teenagers/young adults (whichever age they are when they first get a taste of freedom.) Like how people with newfound freedom often party hard with it, people who've never been in a position of power before can easily take their new authority too far.

Totally not excusing it. It's not some inevitable "human nature" thing. There are good parents, teachers, and others in positions of authority that take their responsibility to others seriously. They're the ones that allow some modicum of function in society.

But those who seek power for its own sake are going to be ruthless about it. Then once someone has power, it's extremely difficult for them to let it go.