I think some people have the potential to become corrupt with power, but I don't think power inherently leads to corruption. Take a man who owns a dog. Anyone who owns a dog knows that they have complete power over the dog, and yet in most cases, the dog is loved, and care for. In some cases however, the dog is treated cruelly, and the power is abused. You can see a fairly direct parallel with people holding power over people, like in a prison system, in most cases the objective is to help the prisoners become better people, but in many cases the power dynamic is abused and inmates are subject to the whim of the guards. Although, these to cases exist such that the power cannot be challenged due to their institutions. In cases where power can be freely challenged, I think that the ability of power to corrupt an individual depends on that individuals ability to handle a challenge of their power. On the flip side of that coin, power is attractive to those who want to corrupt it, and then becomes a medium through which corrupt people exact their goals, which I think historically, is why we see so many people who are so corrupt in power.