That's only one side of the story though. You can be the safest driver -- make that "rider" if we go with the whole "riding makes you more alert" thing -- in the world, and still be involved in accidents due to other's stupidity.
Every time I read a bike thread about road manners, riders whinge (probably justifiably -- I wouldn't know not being a rider) that cars are forever ignoring them. Now it only takes the slightest of taps from some other numb-nuts of the road to send you flying over your handle bars.
Hence, I think its a bad idea. Not only will the "hoon" element be even more at risk of killing themselves, but even the most sensible learner/p-plater could be killed by some other idiot on the road because there is nothing between them and the road besides a bit of clothing and a helmet.
LW.