If you can't take a life to save your own or someone elses, you need to move along into another career.
I remember watching an episode of "Police Story". It must have been 35 years ago. Anyway, it was about a plainclothes Detective ( they never said LAPD, but as Joseph Wambaugh was technical advisor, that's who it must have been ) assigned to the Holdup Squad. They would stake out supermarkets etc waiting for the inevitable to happen. As a result, sometimes he shot criminals. As the ( figurative ) notches on his gun increased, the Department - although proud of his good work - also became somewhat concerned because to the cop-haters, it looked like they had a Detective with a "Wyatt Earp Syndrome" ( as they called it in the show, IIRC ). He was "over his quota" so to speak, except in this case, it wasn't traffic tickets.
So, they sent him to the company shrink. The brain specialist found him to be normal. He was just doing his job. However, due to political pressure, the Department put him back in uniform and sent him to the quietest Division in the city, for a "rest".
As I recall, the story ends when he gets called as backup ( he was a Supervisor ), when it was time to use his gun he froze! Everyone was mad as heck at him.
Apparently, this was caused by all the doubt that had been put into him for shooting so many crooks!