Statistical data is merely history, but a competent historian does not simply let the events speak for themselves. He arranges them according to the ideas underlying the general notions he uses in their presentation. He does not report facts as they happened, but only relevant facts.
We don’t let just anyone repair our homes or perform surgery. So why do we let everyone vote, and, theoretically, let just anyone rule? Jason Brennan’s recommendation is epistocracy: the rule of the knowledgeable.