It is irrelevant,even if it is TRUE, that a woman with a gun will likely have that gun used against her by a rapist or attacker.
The government has zero rights or powers to deny a person their choice of self-defense, even if they have chosen a poor or imperfect in unworkable self-defense.
By that logic, policewomen should not be armed because they will just have their guns taken. Or you could just train people in weapons retention techniques.