Well, it seems to work relatively well when it comes to motor vehicles... Oh, sure, there are still lots of morons driving unsafe poorly-maintained vehicles around, but I'm sure there would be WAY way more if traffic laws (and inspection requirements, etc, depending on your jurisdiction) went byebye tomorrow. The problem, in any case, is one of limited enforcement resources: triple the highway police force, and I'm sure a lot more morons will get caught/fined/forced to fix their vehicles.
Maybe we should first have laws that prohibit making and selling computers without firewalls? In this context I should be fine making cars without brakes, and other security items and just accuse my customers of negligence if they happen to have an accident? Rgds, -GSH