I don't believe it was the owner's fault. You could perhaps argue that it was partially his fault but by doing that you could also say that all parents are partially responsible for their children's death for concieving them in the first place. It was irresponsible for the owner not to act sooner, sure, but it was the little murderer's decision to take an innocent life. If I were there, I would have a hard time controlling myself as I'd be so mad I simply would not think of the consequences. I do hope something truly horrible befalls this truly person.