Well let's start with theft. Just because the keys are there doesn't mean that's an open invitation to take something.
Then there's the business of driving
without a licence
with no insurance
with no name on the registration.
What do you think? Does that go beyond unruly or mischievous? And these are just general considerations. Wait till insurance gets into it. In come cases they may not pay. So now what?
Four general counts and more to come from the lawyers who deal with this sort of thing all the time. I would say that 14 year old better start worrying a bit.
The answer is television and education. Reason is that public goods is a "good that is both non-excludable and non-rivalrous" (I quoted this, I did not plagarize XD)
