One of the biggest killers of innovation is being blinded by hypothetical downsides. It’s easy to raise concerns about why something might be risky. It's much harder to consider the potential harm of putting too many restrictions in place. Consider the de facto ban on nuclear with the establishment of the Nuclear Regulatory Commission. Today we'd have a modern, robust electric grid, and much higher economic growth, if we had kept building nuclear power plants. All around us we see systems…