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Who lost Syria? Comments of some U.S. senators, analysts and journalists, including the editorial board of this newspaper, suggest there is no doubt: Bashar al-Assad and his thugocracy are primarily responsible for the killings, but the tragedy of Syria is also a direct result of a terrible failure of leadership on the part of the international community, and of the United States in particular. Syria, it is charged, is Barack Obama’s Rwanda. Don’t believe it.