If you just want to reaffirm your own beliefs then sure this is fine, but it won't convince anyone because you need to have already equated gender dysphoria with a life-threatening belief.
They may see it as "Imagine a child who is short and overweight but believes he's Michael Jordan and wants to play basketball...", suddenly the affirming parent doesn't seem so bad.
If you just want to reaffirm your own beliefs then sure this is fine, but it won't convince anyone because you need to have already equated gender dysphoria with a life-threatening belief.
They may see it as "Imagine a child who is short and overweight but believes he's Michael Jordan and wants to play basketball...", suddenly the affirming parent doesn't seem so bad.
No matter how hard the child tries, he will never be Michael Jordan. Michael Jordan is Michael Jordan, the kid is his own person.