Not really commenting direcly about the OP but all dog bites.I think it depends on the circumstances: If it was a totally unprovoked attack then there is cause for concern and the dog needs to be put to sleep. If it is a case of poor ownership: rehome the dog following extensive training and assesment. If it was provoked then no i definately think the dog entitled to defend itself, to a degree.
He is a for instance, that i am bound to get flamed for. My dog bit right through my DDs foot, she had to go to hospital, it wasnt stitched but she was told that he had narrowly missed the tendon and that would have caused big problems. My initial reaction was that the dog needed to be rehomed immediately. DD1 was 16 at the time, but we had DD2 who was less than a year old. DD1 was adamant that it wasnt the dogs fault, that she trod on his foot when he was asleep and he just snapped and bit her, then looked horrified, she was able to put him in the kitchen and call an ambulance (which was OTT to be fair, but she was on her own and panicked, she said she called an ambulance because it wasnt bleeding big hole thoigh). I still was insisting that we rehomed the dog but he was a rescue that we had taken on before DD2 and coudlnt go back to kennels due to major kennel stress. So i agreed to keep him and look for a new home, i coudlnt have him around when DD2 was mobile as i coudlnt garuntee to keep separate, he was a huge hulking dog so it would have been a disaster. Anyway, it turned out, very shortly after, we discovered that he had bone cancer, in the leg that my DD trod on by accident, so no wonder he bit her, it must have been agony - yes he was a rotweiller, but please dont think i could ever accept that my dog should have been punished by death for a split second reaction. As it was we did have to have him put to sleep - that dog never grumbled or complained or even so much as curled a lip despite being in terrible pain (the cancer was missed so he went through hell). Imagine how i would have felt if i rehomed him and the last few months of his life were spent with strangers on in kennels .