Culture | Walking on by

Why do so many people fail to do what they know is right?

Catherine Sanderson tries to find out—and asks what can be done to turn bystanders into “moral rebels”

Why We Act. By Catherine Sanderson.Belknap Press; 272 pages; $27.95. Published in Britain as “The Bystander Effect”; William Collins; £20.

This article appeared in the Culture section of the print edition under the headline “Walking on by”

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