For that matter--military are expected to be open to the possibility of going to a war zone and experiencing injury. Yet, their PTSD is recognized and treated and those who have it severe enough do get disability.
Just b/c something is "expected" in a line of work does not make it an adequate litmus.
The problem with PTSD or even in any situation--if we place our own litmus of how "we" would have perceived the situation--we are creating a grave injustice to the person who actually experienced the situation.
I have PTSD and it isn't something I like to admit the source of it b/c it seemed so minor and silly compared to other people who have "real" PTSD. Pretty sad--but that is the nature of our society. Folks without psychiatry degrees trying to put their own spin on the "worthiness" of an event to have "legitimately" caused PTSD.
Heck--my own mother disputes my PTSD at times--b/c whatever caused her PTSD was much much worse.