A Porsche 911 can do 100mph fairly safely in good road conditions (sunny, clear, no other traffic etc), and you can probably chuck it through corners with a bit of pace, but a Ford Focus can go 100mph, and won't be so stable, and is more likely to come unstuck trying to achieve Porsche pace through the twisties.
Therefore the driver of the "low performance" car will probably have an accident, whilst the "high performance" car can "get away with it" so to speak.
It shouldn't be just drivers of high performance cars that benefit from extra training, it should be every road user.
I think that manufacturers should offer courses on how to control high powered cars properly, a few do. They are in the best position to tell you what to expect. It isn't ideal if you are doing your high performance training in a Mercedes SL55 if a Porsche 911 will do something completely different, and a Lotus Elise something else.
I think that there should be some sort of mandetory training on how to handle a car properly when it all goes wrong.
You are shepherded round quiet residential areas at 20mph, doing your "turn in the road" being told all about how to turn into a skid, and what to do when your car starts aquaplaning, but there is no practical training. Therefore when the new driver hits a deep puddle and spins, they have no idea what to do and end up becoming a statistic.
I realise that in some areas it would be impractical to do this, but I think there should be some effort made.