Some of the shootings of dogs are justified, others are not. It depends on the dog and the circumstance, but of course every dog owner will claim their dog was a loveable puppy after the fact.

I am expected to uncritically believe the owners, to believe that all these dogs are harmless and well trained and that they're all being shot for no reason. Well I believe that some of them are being shot for no good reason, but I've seen very little to suggest that most are. And from my interactions with the general public, I am inclined to believe most dogs are, if not dangerous, then at least poorly trained.