KS stating the obvious, that you can't change sex. We are a sexually dimorphic species. Every natural language since the dawn of time we have had words for man/woman boy/girl. If TW were women they wouldn't be trans. It's a fiction in which we are being asked to immerse ourselves.
There's fiction in human life - plays, stories. Sometimes it may be therapeutically useful to go along with that fiction, or it's courtesy. Trans people can be immersed in their fiction but can't compel others to go along with it. And sometimes it's dangerous - eg going along with the fiction when faced with a rapist in a women's prison.
Children aren't going to know it's fiction - they are learning about the world from us and they need to know what biological sex is and that a man may pose specific dangers. And if children get confused about their identities there is a medical pathway they are being funnelled towards before they understand the facts.