In medieval England they used to make accused people carry an iron bar three paces. Depending on how quickly God was said to have intervened to heal it, the accused was set free or hanged. It was called trial by ordeal.
Virtually any system would be better. For example, you could round up 12 people wandering around the street to make a decision. But you probably would not if you were working from from scratch.
The jury system defies what we know from experience. What do we do if we do something difficult, like building a bridge, learning to fly an aeroplane, building a brick wall for a two-storey house, doing surgery and so on? The best results are usually achieved with a gradual build up of theory and practice with the students asking questions as they go … in short, education. Thus surgeons are trained on dead bodies first. Pilots start with simulators and then go up with an instructing co-pilot and so on.
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