Been there, done that. Just like numbersix, I'm sure I was taught at Donington by people of the calibre of Jim W, Dave P not to mention Jeremy E.
But I have to agree with you, it seems that most marshals these days do not know a safe way to right a car. A "touring" car can be safely done by 6 marshals as long as they are led correctly. This type of action needs a "hands-off" leader to watch-over everyone, but is actually quite safe if done correctly.
Just another example of a "Marshalling" skill that has been lost to the Greater God............
HSE !!