I actually have a neighbor who now has a trans girl at 13 years old, since about 10. I knew the child from infancy. So as conspiratorial as it could be, I am literally watching a neighbor destroy their child month by month. It's not a conspiracy.
Instead of just /watching/ a neighbor, you could /be/ a neighbor and get to know them. You might feel differently about your preconceptions when you actually know the human.
They have to convince themselves they've done the right thing, because the alternative is horrifying.