I do think it's a good idea to limit the number of teenagers that can distract another teenage driver. I also like the provisional license thing.
We're in an unfortunate day and age where parents don't police their children and set rules for them like they probably should - be home by midnight, no piling kids in your car, etc. Even more unfortunate, if you don't raise your children, the government will.
I'd vote for it because that's the rule with our teen drivers anyway. It's not that anyone's trying to curtail your freedom, SMC, it's that they're trying to keep you safe.
Add on:
When you get a bunch of kids in a car, many of them won't have the maturity to take the responsibility of driving seriously. They start goofing around, egging each other on and next thing you know, they get their name in the paper and a bunch of junk on the side of the road in their memory.