Sensible precautions make a big difference. And to be clear, a lot of people have dangerous jobs where the consequences of failure may be dire. But it's the difference between working in a hospital and working in a hospital during the pandemic with inadequate protective gear and a fundamental belief that you will eventually contract the virus that you see killing people every day in your ward.
I worked with munitions in the military, moving literally hundreds of thousands of lbs of high explosives hither and yon. I have worked in offices where we've been the victim of bomb threats. I've been personally threatened, verbally more times than you can even imagine, and physically, more than i would like. But outside of a realistic and reasonable caution, I have never thought as I dressed for work that today might be the day I get taken out by a deranged person with a vendetta. I can't even imagine the psychological toll of carrying that around, much less forcing myself to do so because it might make me better at one element of my job.
There is a distinction to be drawn between that and a fundamental acceptance that your life is at risk every second of the day, which is what
@Jared Traveler said is necessary to shoot accurately under stress. As I said earlier, he may have been writing hyperbole, but if he meant it literally, that's alarming. Acute situations are unsustainable long term for most people. So, when you say one must accept that kind of pervasive danger in order to shoot your weapon accurately in a stressful situation, there is a lot to think about. More than just, "Oh, I guess that's the way it is, then."