I have only ever witnessed two non-fatal crashes, & that was traumatic enough at the time until I knew everyone was okay. Over the 20 years I was in the aviation industry I averaged the loss of one person I knew for every year. As harrowing said - just hearing of their deaths was stressful in itself. I think the worst part of one was that I had tried to talk the person out of continuing on, knowing full well that the weather at the other end was pretty bad. He ended up flying into the side of Mt. Macedon.
DF.