I don't disagree, but it is worth remembering that purely hardware systems aren't foolproof either. I had a fuel pump fail on my old car (would be 15+ years old if I still had it), and it took out the brakes and steering at the same time (virtually standing on the brakes to slow down at all, and I ended up running the car off the road as I couldn't physically brake or turn the wheel enough to stay on the road).