Well, dotty, there is not much room for mistakes now that they have DNA testing, so I reckon you are right , especially in a case like this where the whole family are shot. It seems obvious it was executions of some kind, (perhaps) so the same punishment should be given to the one who perpetrated the deed. However, given the power of the people who stopped the death sentence I doubt if this will ever happen.
VHG Dotty was only referring to murderers, especially mass murderers like this.