One of the problems with deceitfully accusing your political opponents of moral abominations falls under the purview of the Ninth Commandment: Thou shalt not bear false witness against thy neighbor. Another is the brutalization and debasement of political discourse.

Yet the promiscuous and proof-free allegation of a moral atrocity — say, of pedophilia — is perhaps most dangerous because it dilutes the meaning of the accusation itself. It empties the claim of real content. It replaces the recognition of a horror with the performance of a ploy.

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Michael Gerson is a columnist for The Washington Post.