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Actually that was a general reference by implication from several posts - not yours specifically. Didn't say it was wrong for someone to tolerate some things, I said I disagree and that it was unacceptable behavior for me. I also assume that the following scenario was implied, not an intentional/hunting kill which is definitely a hopeless case in my book. I'll explain - dogs in a pack i.e. family unit - generally do not fight to the death or kill their siblings, there are postures, body language and vocalizations to prevent that. (And yes, I know this isn't always true in a multi-dog household, particularly one with females that don't really like each other.
A good LGD bonds with his flock/herd and they become his family unit. He may play chase as a very young pup with mouthing (usually grabbing rear legs or flanks) but as soon as the stock vocalizes pain, the pup should instinctively stop. Unfortunately, it can result in a fatal injury. If the owner never leaves the dog unsupervised until he is past the puppy stage, this will never occur. If however, the dog is unsupervised and decides this is a fun activity because there is no correction, it becomes very hard habit to break.
I wouldn't keep an animal as an LGD who has killed stock - intentional or not. Others may very well give him a second, third or more chance. Again, just my opinion.