Every so often I see some politician Gotcha'd with "Can women have penises?" - and the results have always either be flailing or in a very rare case (new Greens leader Zack Polanski) just saying "Yes", in a way which basically hands everything to the interviewer.
And I know that it's really hard to deal with an interviewer who is determined to make you look bad. But it bothers me occasionally that people don't try and explain "But here is my point of view, and where it comes from" - because while saying "Yes" might be very reassuring to people already on your side, it does nothing to persuade others who are just confused by/mildly hostile.
So here, in a simple set of 4 steps is my view.
1) Nobody is choosing to be transgender. It's a difference in brain development. See
here. This isn't new, it's the medical view, and has been for many years.
2) Forcing people to live in the gender that they don't identify as is incredibly destructive to their mental health. This is also long well known. The vast majority of attempts to raise boys as girls and vice versa have appalling impacts on people. The poster-boy for this was David Reimer, who suffered a terrible accident as a baby which destroyed his penis (in the 60s), never knew he was born a boy, and was raised a girl (on the advice of a doctor who believes that gender was just cultural conditioning). And it made him *incredibly* unhappy - within weeks of his parents breaking the rules they'd been given and telling him (at age 13) that he had been born a boy he'd changed his name and presentation. Details
here.
3) Most transgender people are not publicly out. You might get the impression that trans people are all out activists. But the vast majority aren't. They don't want to be "The person who was born one way and is now another", they want to be the person that they are on the inside. So almost nobody they interact with on a daily basis knows that they are transgender. The ones where "Everyone knows about this transgender person" are the exception, most of them are not public about it. As a friend said "My identity is female and back when I transitioned the advice was to deal and vanish into the big bad women's world."
4) Therefore, as a society, we have a choice between either forcibly outing people whenever they want to use a toilet, get married, throw a ball, or otherwise interact with society, or letting them live in the gender that they are presenting*.There you go. That's the humane, liberal approach to transgender people. And every time you get hooked into arguments about the definition of the word "woman", you get pulled away from those very simple things: Nobody asked to be born in a body that destroys their mental health. Most people don't want to be public about that having happened to them (because it stops them just living as the gender they are in their brains). So we can either be supportive or we can torture them.
*And that's the approach that the European Court of Human Rights took, in Goodwin vs The United Kingdom in 2001. They balanced the right of someone to not have to out themselves, against the the negative consequences thereof. And found that the proven negative consequences were basically nonexistent. Which is what then led to Labour being forced to pass the Gender Recognition Act. The rights coming from that, to live in the gender that you choose, are what is currently under attack.