That is about the most awful casual analogy I've ever heard. I doubt hurt was intended, but do be aware that many people have lost children and would find this hurtful.
People are grieving and gently pointing out that perhaps other analogies might be better. There's no ranting nor pitchforks. Just a polite gentle reminder that the loss of a child is an incredibly traumatic thing.
That's a reasonable point. The analogy isn't so amazing that it is crucial to understanding. It cod easily be tweaked.
I would have used it unmodified, but now i will try to change it to avoid dead children.