xhonzi said:
Can you name some, Puggo?
There are many different ways that someone can go bad. It can be due to addiction, seduction, power, insanity, chemicals, or other reasons. Just off the top of my head, some movies/stories that use a variety of these themes would be The Hobbit, The Godfather, Animal Farm, The Invisible Man, The Fly, Re-animator, Requiem for a Dream, All the King's Men...
By contrast, I still don't know why Anakin went bad.