Graham Greene’s observation has lost none of its salience in 50 years: innocence remains “like a dumb leper who has lost his bell, wandering the world, meaning no harm.” The latest illustration comes from Wisconsin, where the state’s Department of Public Instruction website devotes a page to “Power and Privilege.” Caucasians who volunteer in the state’s AmeriCorps VISTA antipoverty programs are instructed to “set aside sections of the day to critically examine how privilege works”; “put a note on your mirror or computer screen as a reminder to think about privilege”; and, in order to underline white guilt, “find a...