That wasn't the intent of the comment. The implied question, is if this is an unusually high incident rate. ie Just how many aggressively dangerous dogs exist and how frequently they are encountered in police action. The statement was an anecdotal sample of an area where people are running, you can get attacked without additional circumstance.

40 years in California, I'd only ever been assaulted by dogs a handful of times and that's because they weren't controlled. Dogs are generally allowed to run freely in their own yards/homes so it makes sense that strangers/police entering yards and homes in a stressful situation, encounter aggressive animals much more frequently.

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.