Can I have a go? Oooo thank you..
Rainboe, it somehow pains me to agree with you but I have to. From every angle, you are absolutely 100% right in your physiological argument.
Now, do we feel better? Has it given us a warm feeling of satisfaction that maybe we have proved our point?
On the other hand, would it really ruin the rest of our lives if we reached out to a fellow human being and said "Yes, you look like a woman, you act like a woman and you have physically committed yourself to being a woman. On that basis, you deserve our respect and we are happy for your happiness because in this crazy world of violence and greed, someone at peace with themselves is a truly precious gift?"