I can understand the fear and anguish of an 80 year old coming home to find a robbery in progress and then being assaulted- absolutely terrible. I can understand him firing in self defence if there was a skirmish, what I can;t understand is him shooting someone in the back as they ran from his property after they had said they were pregnant and were very obviously...
I don't think anyone is saying that reasonable or proportionate force should not be used for self-defence but when that turns into attack, that is where we differ. If I were mugged in the street, I would be allowed to defend myself. If the assailant left the scene but I followed him and severely or fatally injured him, is that self-defence?