The RAAF bought 115 Mirage III's. 39 crashed (hull loss).
22 ejections,
20 pilots injured.
14 pilots killed.
I think training accidents have decreased rapidly for multiple factors over the last 30 years. Systems have improved. They weren't flown by triple redundant fly-by-wire computers in those days, and 'risk management' was simply a calculation on the chance of dying.
Yep, these figures are more or less the same for all operators of the early generation Mach 2 fighters. The Belgians lost 40% of their Mirage 5 and 36% of their F-104 fleets, the Germans (in)famously lost 292 out of 916 Starfighters delivered, France lost more than 1/3rd of their Mirage IIIE, and the list goes on and on for most air forces, with very few exceptions (Spain comes to mind).
Wasn't different at all on the other side of the fence, by the way. East Germany lost almost 50% of their MiG-19 and 24% of their MiG-21, while flying far fewer hours than Western air forces. AFAIR, the numbers for other WP air forces were similar or even worse.
At least for European air forces, in addition to the reasons you mentioned, a lot of losses were caused by adverse conditions - low-level flight in bad weather and/or at night, with rather primitive navigation aids from today's perspective.