I agree that pet owners need to do their part to be responsible, however... if you show up to the WRONG house and shoot someone's dog in their backyard... I think you have to face consequences for that. I get that mistakes happen, but that's on you if you choose to use deadly force. I can be the most responsible pet owner in the world, but I can't protect my dogs from a situation where you show up unexpectedly at my house by accident.
The guy with the two labs... how was he supposed to keep his dogs safe? They broke down his freaking door. Of course the dogs are going to meet you at the door. That's what dogs do. As a responsible pet owner should he have kept his dogs in crates at all times in case the police decided to knock down his door?
The people in the first video... I'm sorry, but as an officer, if you're so worried about the threat of a dog... CLOSE THE F-ING CAR DOORS IF THERE'S A DOG IN THE VEHICLE. There was no reason that dog had to die.
Yes, pet owners need to be responsible and do their part. Dogs shouldn't be running at large. If the cops show up, put your dogs away or hold onto them. But cops need to use some intelligent thought too. If they want to stay safe and keep people safe and not kill unnecessarily... then they need to get some training, and they need to use common sense (seriously, close the freaking car doors... Such an unnecessary "threat" to have happen in the first place).
And sure, sometimes it may be reasonable or necessary with a truly aggressive dog, and sure sometimes accidents happen. I'm glad I live in Canada where this isn't a huge problem.