But don't you also have to trust a bus-driver, airplane-pilot, etc. And all kind of things can go wrong with these human drivers: they might be drunk or under s

But don't you also have to trust a bus-driver, airplane-pilot, etc. And all kind of things can go wrong with these human drivers: they might be drunk or under some medication, they can die in a sudden hart attack, they can just make bad decisions, or even worse - they can be commanded to land the plane into some tower.