A serious logic error
While the averages of the data may say this or that the actual defendant is a human being who is not some statistical average. For a valid justice system there has to be a way to factor in the human element that being the defendant. Some, not matter what the results say, should receive harsh sentences and others with the same 'results' should receive leniency. This task judgment from a real human who can size up the person; we call them judges for a reason.