If that were a real situation, that dog still didn't ask to turn out that way. It shouldn't be killed. That would be a temperment flaw yes, so being to that extreme (or whatever the fault may be) if that is being passed on then maybe the dog/dogs producing such a fault just shouldn't be bred, if they are producing puppies so bad someone feels the need to kill them. That is certainly not the desired result of breeding.
So when that fearful dog bites some kid, it's OK, because the dog didn't ask to be that way? Now you are sued, your dog is killed anyway, and some kid is hurt. Should the person who has a fearful dog never let it around anyone? What if the person doesn't realize they have a fearful dog and think the showing of teeth, hackles up, head down, looking at you from the corner of it's eyes, tail tucked is how a dog shows protection?
So when that fearful dog bites some kid, it's OK, because the dog didn't ask to be that way? Now you are sued, your dog is killed anyway, and some kid is hurt. Should the person who has a fearful dog never let it around anyone? What if the person doesn't realize they have a fearful dog and think the showing of teeth, hackles up, head down, looking at you from the corner of it's eyes, tail tucked is how a dog shows protection?