"I disagree. If you are justified, you are justified. If you ain't you ain't."
Justified or not is decided by a judge or jury not the law. Perceptions matter. I carry a surefire flashlight in my left pants pocket to use. I would never attach it to my gun for carry purposes for the same reason I would never attach a laser to a carry weapon. It is something that can be used against you in court. We used IR and visible lasers in the Navy they can be useful. I find night sights to be fairly useless as well. Attach whatever you want to your home defense weapon. A shooting on a home intruder is vastly different to a shooting in public.