As the terrorists of the Islamic State of Iraq and Syria (ISIS) threaten Baghdad, thousands of slaughtered Iraqis in their wake, it is worth recalling a few of President Obama's past statements about ISIS and al Qaeda. "If a J.V. team puts on Lakers' uniforms that doesn't make them Kobe Bryant" (January 2014). "[C]ore al Qaeda is on its heels, has been decimated" (August 2013). "So, let there be no doubt: The tide of war is receding" (September 2011).

Rarely has a U.S. president been so wrong about so much at the expense of so many. Too many times to count, Mr. Obama has told us he is "ending" the wars in Iraq and Afghanistan—as though wishing made it so. His rhetoric has now come crashing into reality. Watching the black-clad ISIS jihadists take territory once secured by American blood is final proof, if any were needed, that America's enemies are not "decimated." They are emboldened and on the march.

The fall of the Iraqi cities of Fallujah, Tikrit, Mosul and Tel Afar, and the establishment of terrorist safe havens across a large swath of the Arab world, present a strategic threat to the security of the United States. Mr. Obama's actions—before and after ISIS's recent advances in Iraq—have the effect of increasing that threat.

On a trip to the Middle East this spring, we heard a constant refrain in capitals from the Persian Gulf to Israel, "Can you please explain what your president is doing?" "Why is he walking away?" "Why is he so blithely sacrificing the hard fought gains you secured in Iraq?" "Why is he abandoning your friends?" "Why is he doing deals with your enemies?"

In one Arab capital, a senior official pulled out a map of Syria and Iraq. Drawing an arc with his finger from Raqqa province in northern Syria to Anbar province in western Iraq, he said, "They will control this territory. Al Qaeda is building safe havens and training camps here. Don't the Americans care?"