Stories that adults tell kids tend to not make a lot of sense if you even give them a small amount of thought, and I guess adults figure it's fine because kids don't know anything and will just believe what you say. In reality, though, I think a lot of kids just humor their parents and make them think they believe it when they really don't. I mean, the bunny brings the eggs at Easter, and in another childhood story, a stork brings live children? I don't think it would be that hard to switch those. It would make a lot more sense then.