If you collude with your son that he's really a girl, and needs to be able to play in female sports, then yes, you are every bit as bad as the people who are making these decisions in positions of authority. Of course.
Anyone who plays sport does not need the very basic dynamics of how sport works explained to them.
They just don't.
Or is this, yet again, one of those well what if there was a male, a very vulnerable person, who truly thought they were the opposite sex, and played sport, and didn't understand why it was a problem, and had never given any thought to the girls they would be beating, what about them? Would it be acceptable then?
It reminds me of the poster who asked whether or not toilets that had normal height doors, but a mesh across the top so people couldn't look over, and a mesh from the bottom of the door to the floor, and little bowls of Tampax in each one, and they were checked daily for cameras, would it be okay then if men were to use them?
It's quite extraordinary how people have never heard the word no.
The answer is no.