The prevailing view ahead of tonight’s presidential debate, with which this column agrees up to a point, is that Hillary Clinton faces a much more difficult task than Donald Trump. He has to convince viewers that he is sane, while she has to persuade them to trust her.

It is possible he will fail, but it is difficult to see how she can succeed. “The concept pre-loaded with associations most damaging to immediate assessments and future dealings is untrustworthiness, along with its concomitants, such as lying and cheating,”...