I think the dichotomy lies in the fact that if he had a shotgun, and shot them, each with a 'clean hit', they would have both been dead no question, and we wouldn't be having this conversation right now.
But because he had to install 4 discs to finish the job, people are up in arms, some of you are sympathizing with the girl by stating ''she's only a girl'' not realizing how demeaning this could be to other members on the forum. Think with your minds, not your dicks. Roses have thorns too, don't judge a book by its cover, looks can be deceiving, but I'm sure you all will get married one day, after you stopped wailing over a dead thief you never knew.
You'll never know what the intentions of the deceased were, but if they were experienced robbers, they knew one day they would have to face this type of situation, in the US of A no less.
I'm not saying grandpa executioner was right, but he probably acted in the heat of the moment.
He already had her down. She wasn't getting back up. There was no need to execute someone over a few hundred dollars worth of stuff.