All depends upon what you get acclimated to. My grandfather ran a wrecker service. I spent all my summers with him. When we got to driver's ed in school, they had all these horrible accidents (always in black and white with those blocks covering their eyes). I would look at them and say, "heck, I've seen worse than that. Once there was this wreck over on such and such road........"
Don't know if that was good or not, but having seen the real thing photos didn't phase me. It was a bit weird, while some of the accidents were gruesome I sort of absorbed my Grandfather's idea of we are here to do a job after this terrible thing happened. So you just compartmentalize things to do what you have to do. I actually think it helped me do that in other areas of life when things needed doing. It was harder to do with live people suffering at the moment with horrid injuries. Even on that my Grandfather was non-judgmental with the idea if we could, you do what you can to help people in need of help. Falling apart yourself did no one any good.