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A good solution is to clearly show how the flaws are an obstacle for the character when they try to achieve their goals. For example, if the girl in your story manages to seduce the boy who is in ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/38176 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
A good solution is to clearly show how the flaws are an obstacle for the character when they try to achieve their goals. For example, if the girl in your story manages to seduce the boy who is in a relationship and has great sex with him, it might seem as if you endorse such behavior. But if the boy rejects her and expresses his contempt for her because she tries to have sex with him although she knows that he's in a relationship and others witness her attempt at seduction and she is socially isolated as a "slut", then all this makes it clear to the reader that you do not endorse sluttiness but rather want to show how it is a problem for those who behave in such a way, because it increases the loneliness and leads to further trauma.