There's a possibility that all the particles in my body might leap simultaneously one foot to the left, or that I might transform into a bowl of petunias. The

There's a possibility that all the particles in my body might leap simultaneously one foot to the left, or that I might transform into a bowl of petunias. The question is how likely playing chess or riding in a car might squash me like a pancake. We accept a not insignificant risk by driving ourselves and riding in cars driven by humans. Happily, it's not hard to estimate the risk that a machine-controlled car poses by letting them roam around. We can compare that with human-controlled cars and start shifting between controllers according to their risk profiles. I'd much rather have a machine-controlled car than a human asleep at the wheel.