Twenty years ago I took a class in the legal aspects of self defense at the old Queens Village Rifle & Pistol Club.
The instructor was Frankie Demarrio, who was a NYPD firearms instructor at Rodman's Neck.
Frank stated that there are three types of gun owners in the world.
1) Has a gun but could never, ever, under any conditions, take a human life.
2) Has a gun and is looking for a legal excuse to use it and not be charged. ( A la Bernnie Getz)
3) Has a gun and is willing use it in the defense of himself or others, but only if no other option exists.
Franks advice to #1 was to get rid of the gun.
If not willing to do that then get a very realistic toy gun.
To #2 Frank's advice was to get yourself a very good lawyer and a large jar of vaseline, because sooner or later you will need at least one and probably the other.
As to #3 Frank just smiled and said to relax.
If you do shoot you will most likely follow the law wheiter you know it or not.
Sound advice, IMHO.
Another good tidbit that I picked up in my younger days was that if you have a doubt--or if you find yourself thinking if your current situation demands deadly force--then you probably should not be shooting.
I believe the exact words were, "If in doubt, then doubt!!"
This alone was in my mind and convinced me not to pull the trigger in several situations.
So..who are you?