Henry Kissinger used to say that while it can be dangerous to be an enemy of the United States, to be a friend is fatal. The people of South Vietnam learned that bitter lesson when the United States abandoned them in 1975. The Poles learned it after Yalta, the Hungarian freedom fighters learned it in 1956, and Cubans learned it at the Bay of Pigs. And tens of thousands of Iraqis learned it in 1991, when at the urging of George H.W. Bush they rose against Saddam Hussein, only to be slaughtered when American support never materialized. Now we can...