Hey, the way I look at it, it's fine by me.

If the "doctor" is right, and thousands of parents believe them, then the children are safe.

If he's wrong, then thousands of children will die and we'll know that he was wrong. Perhaps the parents will then learn to ignore things like this and belive medical science.

In any case, it doesn't matter in the big picture. If the parents are willing to gamble their own children's lives, why should we be concerned?