They have a Need for Control
When powerful people are caught cheating, the rationale that usually comes is the fact that the person’s ego was so big that they felt that they were untouchable. While that’s probably true, another study brought in the idea of control.
If a person is powerful, that person has a tendency to be in control of certain aspects of their lives, namely the talent that got them their power. Though the person might not actively sit down and plan to cheat, they might go through with it for the fact that they believe that they can control the situation.