Aleppo has fallen. And much of the West is awash in a considerable amount of guilt over the Syrian city's fate. The Eiffel Tower was dark yesterday in honor of the victims of Bashar al-Assad's regime in Aleppo. In Britain's House of Commons, ministers grandly accused themselves of their own inaction. George Osborne, a conservative MP, said that there was "some hope for what might come out from this terrible tragedy in Syria, which is that we are beginning to learn the price of not intervening." The horror in Aleppo is easy to mourn, because the West is now so thoroughly not in a position to...