Don Juan is a disgusting character. He uses women and discards them, breaking their hearts abusively. He does this all for his own pleasure. Then he dares to make eloquent excuses, expressing his reasoning in a way that puts his horrid actions in a positive light. If we were to meet such a man in the real world, we would detest him and say terrible things about him.
Yet, one cannot help but love the character of Don Juan.
Perhaps its because his aforementioned eloquent excuses capture us. Perhaps its simply because he is so amusing.
How is it that we are able to look past his obvious flaws? Usually, we forgive characters because of the story behind their mistakes. Maybe the character had a rough past, or maybe the character was abused as a child. However, we know of no such thing in the case of Don Juan. In fact, we know very little about his past. There are no reasons for his awful nature; that’s just the way he is.
In this sense, Don Juan is an unrealistic character. He has such strong characteristics of pride and domination, but he is not dynamic. He does not change through the course of the story and he is a flat character, making it difficult for the reader to relate to him.
This may be the very reason we overlook his flaws. He is not a real person, just a character. We do not take him seriously. He is made up to be amusing; thus we find him so.