It is not as simple as that. The flaw is more basic, it is in me, it is in you, and it is the work of a life time to try to control that, diminish that tendency to evil. We can never be sure that we have finally mastered it. When I was growing up we heard too much about sin, certainly too much about sexual sins. I think it is very possible that the pendulum has swung too much the other way now.
Sin is out.
Use another heading. Sin is something personal, we choose evil and we are able to do that because we are free. So sin it not an unintentional mistake. It is not like breaking a taboo where it does not matter whether you mean to do it or whether you don't. While there are definite standards of right and wrong, God only judges us on our honest understandings of what is right and wrong.