It’s definitely to do with work conditions. I’ve been a paramedic for fifteen years, and suffice it to say, I’ve seen (and smelled and heard) some shit. I’ve always felt that I had a harder time processing the stuff from when I worked in a busy metro system and we had to go from coding a kid who drowned just fifteen feet from a party full of adults to holding grandma’s hand and making her warm and comfy on our five minute jaunt to dialysis to “hey, there’s a car on fire and bystanders report hearing screaming from the vehicle”. I would regularly get three hours of sleep over a 72 hour period and have almost no time to process the horrible shit we saw while still having to be a functioning, caring professional for every patient along the way. The also horrible shit we saw in the slower rural area I worked in has haunted me a lot less. There’s probably more to the whole picture than that, but I’m confident that work conditions are a huge factor.