You're assuming everyone who has an accident on their P's is a hoon. Most accidents involving P platers are as a result of low driving experience and education - speeding, driving whilst drunk, not paying attention, getting distracted, going too fast for the conditions eg. in the wet.
There are a lot of people out there that aren't hoons who just need more practice. I've done the Advanced and Defensive Driving course with Driver dynamics and it was awesome - learned a lot and IMHO made we a better driver.