So the primary Safety Case argument is simply "If you can't take a joke you shouldn't have joined..."
Thanks Tourist - it's given me an insight. I've spent most of my adult life on the design and support side of the fast jet community, and had a PPL-IMC before marriage & kids got my flying "correctly prioritised" (as my better third put it) 18 years ago, but I've only ever had 2 hours of rotary stick time (both in a piston Enstrom). If I won the lottery that might change, but I don't think it's going to happen any time soon.
PDR