Excerpt: The Defense of Marriage Act is an exception to the rule that a law’s title is as uninformative about the law’s purpose as the titles of Marx Brothers movies (“Duck Soup,” “Horse Feathers,” “Animal Crackers”) are about those movies’ contents.

The recent rape conviction of two teenagers, one of whom also distributed a photo and sent cruel text messages about their victim, has captured the “bystander effect” in graphic and nauseating detail.

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