I'm struggling to see how you can be so calm about what you just said. To me, the idea of a system that works 99% of the time and doesn't work 1% of the time is utterly terrifying, far more so than a system that works only 50% of the time. 1% is small enough for a human operator to become complacent, but still many orders of magnitude greater than an acceptable risk factor. It seems like exactly the sweet spot that's going to maximise loss of life.