a few things I learned in my LAW CLASS
Self Defense with deadly force is only lawful when you are protecting property and people, NOT PROPERTY ALONE!
Meaning if you see someone stealing your car, even if they have a visible weapon, and you say FREEZE and provoke them to shoot at you, or say FREEZE and shoot at them, either way, you would be convicted for attempted murder or manslaughter!
You cannot use DEADLY FORCE in any situation to just protect property.
If someone eneters your house and has a knife or a gun is coming at you, IT IS LAWFUL TO SHOOT THEM RIGHT THERE AND THEN, however, IF YOU even take ONE STEP back, that is called retreating, and you could be and most of the time will be convicted for manslaughter, for retreating then provoking the BG, it does not matter that he is coming after you, if you retreat, you can't come right back and shoot them, unless you can prove to the jury by a prepondernce of the evidence that you absolutely positively had to, in any way shape or form.
Remember, people on the jury aren't avid gun owners, so they do not see eye to eye with gun use as we do. WHen they do jury selection, they will not use people in favor of guns, it would alter the outcome of the case in favor of the person using deadly force for self defense.
And if you are in a situation in public where someone aims a gun at you, the law says you are suppose to retreat in 9/10 situations, UNLESS YOU CAN PROVE TO THE JURY there was no retreat what so ever, and using deadly force for self protection was the last resort thing.
SO say you successfully shoot a bad a guy, and the self defense using deadly force was justifiable, the bad guy looses in the criminal case, but him or his family members can sue you in civil court and actually win, we live in a sad justice system.
SO in summary, the law encourages retreat whether in your house, and always always in public. Deadly force is not encouraged unless there is no escape, and ignorance of these laws is not a defense.