Experiences on controversies such as these brings out the impossibility of learning anything from facts till they are examined and interpreted by reason; and teaches that the most reckless and treacherous of all theorists is he who professes to let facts and figures speak for themselves, who keeps in the background the part he has played, perhaps unconsciously, in selecting and grouping them, and in suggesting the argument post hoc ergo propter hoc. [italics are original, bold is my emphasis]
A similar idea was given to me almost 25 years ago by faculty members at The University of Alabama (Don Hooks I believe, but I’m not quite sure). He said you shouldn’t just give them facts, but also the ruler to measure them with. He was referring to the promotion and tenure process.