Sometimes it is (4) their owners let a friend drive the car and the friend is not remotely equipped to handle the car at the speeds involved.

Not saying that's what happened here (I haven't seen any reporting on who was driving vs who was the passenger) but it is at least part of the reason Paul Walker is dead.

Of course, the owners themselves even if they are skilled drivers, shouldn't be driving outside of legal limits on public roads.

If you have an exotic sports car worth half a million dollars and you want to go crazy with it then rent a track, you can afford it.