Haha. That's certainly an interpretation of what happened in those tragic accidents. I would say that those accidents were caused by the kids having the keys to the car.I mean- no, it's demonstrably not- otherwise none of those other accidents could've happened.
If a child opens a gun safe with the key would say that the problem was that the child had access to the gun safe or the key?
I guess kids never go anywhere they're not supposed to go or do anything they're not supposed to do while supervised. Would it be unreasonable to let a child out of a car seat with one parent in the passenger seat while the other parent goes into the store? Would it be unreasonable to let your kids be inside the car while you wash it? Both of those are scenarios where there could be a safety issue even when most people would consider the child as being "supervised". It's impossible to predict all the scenarios where this could be an issue."Letting a kid who should be bucked into a car seat in the back roam freely, and climb into the drivers seat" is not "supervised" by any rational definition of the term.
I would be very surprised if there is a law requiring children to be buckled into a car seat when the car is off.Sure- or in this case, for any car, either don't have a little child inside at all, or have them inside buckled into a car seat- which AFAIK is actually required by law in most states.