At what point do you consider using deadly force? Here in Va, there must be 3 things present to use deadly force:
Intent - That is the bad guy is there and is showing intent to be a threat.
Opportunity - This is you and/or your family.
Ability - What do they have to carry out out the threat?
At this is is what we were taught in my CCW class.
Example: If someone has just busted into your house and is standing there bare handed. Deadly force is not an option. Now if the empty-handed BG then made a move for a family member, or their room, then it's game on because we have the right to protect our family. Screwy, but it's law here.
My CCW instructor ( who is a deputy for a local office) told us about a real case, which is very similar. A man buys his wife a shotgun for HD, teaches her how to use it etc. She is a very nervious sort, local PD is there a lot for strange noises, etc, as her husband travels a lot. One night, someone broke the glass in her door trying to get it. She shoots twice (#00 buckshot), and the person "breaking in" was DRT (dead right there). Turns out it was her neighbor, coming home after having too much to drink, and thought it was his home. The woman is a mess mentally now, sees a shrink, etc. I dont think the law came down hard on her, but they very easily could have. IOW, her's was not a good shoot.