A woman’s mitzvah has nothing to do with men. Helping men is a side affect, not the cause. I doubt the inch on the knee is why a man is having taavos. Usually, it has to be something more extreme.
Men have their own mitzvos to worry about. Women have theirs.
What if a woman is following her halachic psak and a man has taavos anyway? What if her psak allows a skirt mid knee?