When I was young, a mantra among progressives was that America had to stop operating as global policeman. Vietnam was the signal episode of arrogant and ultimately self-defeating American overreach. But there were plenty of other cases of the U.S. government doing the bidding of oil companies and banana barons, and blithely overthrowing left-democratic governments as well as outright communists (or driving nationalist reformers into the arms of communists.)
The world's most feared jihadi group, the Islamic State (ISIS), is parlaying its dramatic gains in Iraq into Syria. Already flush with cash and weapons, ISIS stands to receive another, invaluable windfall in Aleppo, Syria's largest city prior to the war. Regime forces there are on the verge of encircling opposition militants. Their success in doing so would benefit ISIS as much as it would Bashar al-Assad, throttling the more moderate rebel enemy both share.
Dangerous sectarian tensions, massive movements of refugees, daily atrocities and spreading instability make the civil war in Syria a global threat. All the values for which we stand, and all the reasons for which the United Nations exists, are at stake across the devastated landscape that is Syria today.