In the art of rationality there is a discipline of closeness-to-the-issue –trying to observe evidence that is as near to the original question as possible, so that it screens off as many other arguments as possible.

The Wright Brothers say, “My plane will fly.” If you look at their authority (bicycle mechanics who happen to be excellent amateur physicists) then you will compare their authority to, say, Lord Kelvin, and you will find that Lord Kelvin, is the great authority.

If you demand to see the Wright Brothers’ calculations, and you can follow them, and you demand to see Lord Kelvin’s calculations (he probably doesn’t have any apart from his own incredulity), then authority becomes much less relevant.

If you actually watch the plan fly, the calculations themselves become moot for many purposes, and Kelvin’s authority not even worth considering.

The more directly your arguments bear on a question, without intermediate inferences –the closer the observed nodes are to the queried node, in the Great Web of Causality –the more powerful the evidence. It’s a theorem of these causal graphs that you can never get more information from distant nodes, than from strictly closer nodes that screen off the distant ones.

Jerry Cleaver said: “What does you in is not failure to apply some high-level, intricate, complicated technique. It’s overlooking the basics. Not keeping your eye on the ball.”

Just as it is superior to argue physics than credentials, it is also superior to argue physics than rationality. Who was more rational, the Wright Brothers or Lord Kelvin? If we can check their calculations, we don’t have to care! The virtue of a rationalist cannot directly cause a plane to fly.