You can't equate airplane safety with automotive safety. I worked at an aircraft repair facility doing government contracts for a number of years. In one instance, somebody lost the toilet paper holder for one of the aircraft. This holder was simply a piece of 10 gauge wire that was bent in a way to hold it and supported by wire clamps screwed to the wall. Making a new one was easy but since it was a new part going on the aircraft we had to send it to a lab to be certified to hold a roll of toilet paper to 9 g's. In case the airplane crashed you wouldn't want a roll of toilet paper flying around I guess. And that cost $1,200.