Its not the dog's fault he was raised by a human to be aggressive to other dogs or people.. People can argue its not the owner's fault cuz the dog will do what he does - BUT the owner, by then, should know the animal's characteristics and have him in a muzzle or at LEAST a leash.. This owner did none of those things..
So, the dog will be euthanized because of how a human raised him, and the human will go scot-free with maybe a small fine.. My guess is potentially the same owner may be in the same type situation in a few months or years..
Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..