I've worked in healthcare for the past 13 years and have been exposed to gruesome stuff in level 1 trauma. The burnout doesnt come from seeing gore, the burnout comes from working long shifts and having to deal with miserable fucks daily (both staff and patients). I've yet to encounter a doctor, nurse, tech, etc that has had PTSD from their job. Desensitized? Yeah. Sick of their profession? Fuck yeah.
I mean, we all knew what we were getting into and schooling kind of prepared us for it (somewhat) during gross anatomy of human cadavers and th shock factor wears off after a while.
Some things you can't unsee, especially when you have a 3 month old son at home and have to do CPR on an infant or deal with child abuse/death.
Just my perspective.