Men do not become women by "identifying" as women or even by having surgery and hormone treatments any more than surgery and hormone treatments or self-identification makes a dog a cat.
They just become mutilated men. Or dogs.
This is NOT the issue in the bathroom controversy. The safety of women from non-transgendered perverts posing as transgendered people is the issue there. But the fundamental sickness of this whole "gender identity " nonsense is nevertheless a very important, though separate, issue in our increasingly warped and sexually confused society.