The argument that someone would put their dog down or send it off if the dog was aggressive to a child is irrelevant as that's not what's the topic here.
I think you're missing the point that was illustrating. Most people clearly would send the dog away in that instance. Because the dog isn't just as important as another family member i.e. the child! The point was supposed to be clear and just made in that single sentence a few posts back. Do you acknowledge that is the case or do you have a different opinion on that?