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Yet such a simple enumeration fails to get at the danger.

Earlier this month Bill Moyers described Trump as “a psychopathic narcissist whose alt-right agenda offers so many threats to the well-being of our country and the world, they defy simple enumeration or categorization.”

A method of proof which, when used as directed, gives sometimes truth and sometimes falsehood—as the method of simple enumeration does—is obviously not a valid method, for validity demands invariable truth.

According to Mill, the law of causation is proved by an admittedly fallible process called “induction by simple enumeration.”

Some such principle as this is required if the method of simple enumeration is to be valid.