A few years ago, I was joining CFS Helicopters at Shawbury and was doing my conversion to Squirrel. I cooked an engine on start as I turned the throttle the same way as my motorbike. The instructor (sqn boss) took the blame as he was captain. A year later I replaced him as boss. My policy mirrored his..... if you sack or severley punish people for errors, they will not report them when they happen. It continues to work and people are honest when things go wrong, safe for all future crews.