Funny, but I also fly on an AEF and the idea that air cadet flying over the past ten years was demonstrably safe is just plain wrong. One of the themes of this whole thread is that the loss of life and aircraft disaster was predicted years and years ago when the MOD started to civilianise flying. The poor maintenance practices on the gliding side are simply another symptom of a poor system.
You seem to have missed the point of DEMONSTRABLY safe. The gliding schools, run by skilled and enthusiastic volunteers kept inadequate records, for reasons which were systemic. As you are aware, but willingly overlook, the tragic loss of life in AEF flying had nothing to do with contract supply of aircraft.