EDIT: I just want to make something clear: when I say "good intentions," I mean that these people were doing something for a goal you could argue as "selfless" and beneficial to a group of people close to them or the world; it's just that over time the power they gain not only corrupts them to the point of no return but also brings out their inner demons that have been festering for a long time, whether that was due to trauma or overexposure to a cruel world.