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In this Tuesday, Sept. 11, 2001 file photo, pedestrians in lower Manhattan watch smoke rise from the World Trade Tower after an early morning terrorist attack on the New York landmark.

Mark Riley: Two decades after September 11 we quite rightly and soberly ask ‘For what?’

Main Image: In this Tuesday, Sept. 11, 2001 file photo, pedestrians in lower Manhattan watch smoke rise from the World Trade Tower after an early morning terrorist attack on the New York landmark. Credit: Amy Sancetta/AP

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