Chaining a dog inside a house/apartment unsupervised isn't responsible.
How do you know the dog was “unsupervised”? The owner was in the kitchen area, and the dog was too, apparently. How do you get “unsupervised” from that??
Breaking down an innocent man’s door and shooting his dog is criminal.
Unlawful government employee intrusions are an established pattern.
Whereas in the case of the owner, his reason for chaining his dog inside the house has not been established.
Odd, how you are focusing on an apparent wrong, rather than an actual wrong committed. One might suspect your goal was to minimize the latter.