Hypocrisy does not make you wrong, but it hands your critics a convenient weapon. When David Cameron, Britain's prime minister, visited Sri Lanka for the recent Commonwealth summit, he was right to insist loudly and publicly on the need for a proper investigation into the carnage at the end of its civil war in 2009. But this week, on his next trip to Asia, that robust riling of his hosts laid him open to charges of double standards, as he indulged in three days of conciliatory schmoozing in China.
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