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By any measure, it was a moment to mark in the anguished history of sectarian dispute in Northern Ireland: 10,000 people, mostly Catholics, mostly enlistees in the ranks of Irish nationalism, applauding last week as a giant television screen in Londonderry relayed a British prime minister apologizing in the House of Commons for the brutality of British troops in the city on “Bloody Sunday.” To be sure, David Cameron was speaking of events on Jan. 30, 1972, when he was just a small boy.