Bingo! I have a friend in the UK who organizes "post-mortem" (no pun intended) workshops and process training for hospital staff, precisely to do the NTSB-like thing after medical procedure errors occur. Rather than trying to point fingers and identify scapegoats, the central question is: "what went wrong here, and how do we reduce the chances of that happening again?"
Of course, occasionally the answer might be "We hired the wrong person, and we should fire them", but that seems to be only very rarely true.