That Sounds A Bit Unusual To Me
To my mind, that sounds a bit extreme and counterproductive.
If that is one of your "unwritten law of CCW", I sure hope you also subscribe to the FIRST and FOREMOST and MOST IMPORTANT "unwritten law" of CCW:
Intimately know ANY and ALL of the WRITTEN laws of your residency state which govern CCW and the lawful exercise of self-defensive Lethal Force.
The truth of the matter is that in the vast majority of cases where civilians utilize a firearm for lawful self-defense, violent felony crime is deterred, controlled, prevented, merely by display and presentation of the firearm, without need of any actual shots fired at all.
Immediate problem immediately solved, and without need of anyone being hurt. That's the best outcome anyone could possibly hope for.
Of course, if the firearm has even cleared leather, presumably 100% legal justification for spilling blood already exists in your own mind and conscience. Thus,
if shots need be fired, they presumably, certainly will be. Your action had better be reasonable to the mind of your local Prosecutor, or else you will be facing a jury of 12 of your peers who will be conducting a preponderance of all pertinent evidence to determine if your action, in their opinion, was reasonable or not, and in compliance with the Law or not.
I do not disagree with your statement in the general sense, to the extent that you have already made the decision that you are capable and willing to exercise lethal force in self-defense if and when justifiable and warranted. And I do wholeheartedly agree that the first valid so-called "Victim's Right" is the right to not become a Victim of a violent criminal Predator in the first place - not for any reason whatsoever.
But your statement above clearly infers or implies your apparent (?) mindset or belief that if your gun clears leather in your hands, blood WILL be drawn.
Best be careful what you say in public forums.
If you are ever involved in a SD shooting, prosecutors can have their field day in court with your own statements, since they are admissable, prima facie evidence of the mindset you held and carried along with your gun when you strapped on that gun and walked out into the public domain.
Put another way, carry your "big stick" if you will, but sometimes it's Wise to both walk as well as talk softly . . . JMHO