I think the incident with the arabian driving class gone wrong was preventable.
If anyone pays close attention- look at the tail length on those horses! In order to keep their tails in pristine condition, those horses are often stalled. Being arabians, they do not get enough exercise when stalled, and come into the arena all hyper and ready to go. I don't see why most people would want to drive a horse like an arabian (as they are so high strung), and I don't see why it makes any sense to stall them all the time...
For those arabian people on here, I am sure there are some that do well at it, but most Arabians are not what I consider suitable for driving. I won't ever teach my TB to drive either- No thanks!
Driving should be reserved for a horse that is dead quiet and only spooks in place. The vast majority of horses do not match that description!
The only reason I am considering driving with my mare is because her spook is to flinch and stop. The only time she threw me off was when she stepped on the hose and it blasted on underneath her. She jumped forward a few strides and stopped and I slid off her hind end. She was only 2 when that happened.
Her reaction to being ground driven with poles? None. Her reaction to guns? None. If she looses the pole when ground driving, what does she do? She stops. If a deer jumps straight out of the bushes at her, what does she do? She stops. That is what you want in a good driving horse.