The current laws allow Ford and Holden to produce these type of cars for P platers, this is business. Furthermore, these cars are cheap to make and cheap to go fast in a straight line. Then kids (and some companies) forget about the brakes and suspensions to handle all that power. I'd take my chances in a Skyline than a Ford but that's not the point as you said (besides P platers can't drive GTRs). The point is these 6 kids should have known better, they should have checked each other but they didn't, and they picked the right car to speed quickly to 140km/h on suburban roads and hit a tree.
If the law enforces further restrictions on powered cars, in particular Holdens and Fords, this will affect business and big bosses don't want that.