Not all cases end in administered deadly force leaving the offending individual dead or even shot.
Example A: Heaven forbid I miss and that miss instantly turns a deadly threat into a passive non-threat that has an articulate and vastly different story than mine when the police arrive. How hard is it for someone to have a plausible explanation for interaction with you and being in that area? A smart crook could have this loose end tied up. I try to never underestimate what I may be up against.
Example B: Worse still, I shoot and wound some "pillar of the community" that screams bloody murder and no longer poses a threat. Now I've got a screaming perp and a crowd of "witnesses" with a vastly different account of what really happened.
It isn't all sunshine and lollipops. It sucks and you had better get used to suboptimal situations, outcomes, maintaining a solemn attitude and an infinitesimal amount of patience. I shoot a lot and have a high skill level with a handgun, however I am prepared to deal with something other than a one shot stop. I also cheat and bring a second responsibly armed person with me a lot. Drives my odds of survival/AVOIDANCE way up and there's always two stories that match.