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Perspective: The villian normally sees himself as doing the just thing, or he can also see himself as doing something that, in the end, will only satisfy himself. While that person sees himself doing right, another will most assuredly say that he is doing wrong, and human nature will usually oppose it.
The conflict between good and evil is one of the most conventional themes in literature and is sometimes considered to be a universal part of the human condition. There are several variations on this conflict, one being the battle between individuals or ideologies, with one side good, the other evil. Another is the inner struggle in characters (and by extension, humans in reality) between good and evil.
From the earliest times, writers have thematized the conflict between good and evil in religious terms. In the old testament, Yahweh (God) asks the prophet Jeremiah: "The heart is devious above all else; it is perverse - who can understand it?" (Jer. 17:9)
While certainly not as widely seen as the direct good vs evil conflict, the concept of "individual vs self" is often much more compelling to a reader, especially if it is the protagonist. It requires well written character development in order to truly succeed.
The struggle of good vs evil in my own sphere of influence has given me much to use as material for developing my stories. Each person has their own diverse life experience that is worthy of using in character development for their protagonist and antagonist. A good story will speak to the heart and will foreshadow the struggle of the human condition in its characters.