*raises hand*
Well, as Virginiap said earlier, his father ( a muggle) abanded him, something that led to his hatred of muggles and mudbloods (pardon my language). When he started to think of ways to get back at him, he probably learned that there was a whole world of dark magic that he had not known about. With that dark magic came power, and I think that once he figured out that people would even follow him if he was evil, there was no turning back.
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