For good or bad, the American legal system (and the English one on which it's largely based) is about who makes the better argument. It's a debate contest among

For good or bad, the American legal system (and the English one on which it's largely based) is about who makes the better argument. It's a debate contest among expert jurists. The judge is supposed to be knowledgeable about the law, and particularly good at recognizing logical fallacies. A good judge who is not an subject matter expert should be good at asking the salient questions and stopping a rambling jurist in their tracks. The whole idea isn't to become an expert, it's to find the right questions, and provide the opportunity to expediently arrive at conclusions and solution to them. And it often is just one question.