I tend to agree that p platers shouldnt be allowed to drive powerful cars, that being said they can still get into plenty of trouble in almost any modern car with fuel injection.
When I was on my P,s this type of thing wasnt a big problem as young people generally werent as affluent as they are now. Neither me nor any of my friends at the time could afford anything powerful as they were too expensive, but now I see lots of young people driving XR6 turbos, Skylines, WRX,s, etc. The first car with any kind of power I owned was my NXR with 105kw when I was 22 which isnt that powerful and it was FWD anyway so I couldnt go sideways around corners.
I got into plenty of trouble in that car but I never overstepped my own limits, in my opinion I think the passenger curfew will have a positive effect as I always had people "egging me on" as soon as I got a sports car, but I never got drawn into doing things other people told me to do. I think a lot of teenagers get killed because they are trying to impress their mates and bite off more than they can chew. Ill bet that the guy on the news in the wheelchair wasnt telling his mate to stop, he was probably telling him to go faster. If it was his friend he would know how that person drives and still made the choice to get in the car with him. People always change their opinion as soon as the shoe is on the other foot, he probably thought it wouldnt happen to him.