If you don't know where you're going, the old saying goes, any road will get you there.
The conventional wisdom on Syria has it that the external actors to the tragic drama playing out these many months don't know what to do, have no end game, and are thus incapable of acting alone or in concert to end the killing and create an effective transition to the post-Assad era.
But that's wrong. The key actors -- America, Russia, Turkey, Iran, and the Arabs -- know precisely what they're about (or at least what they want to avoid) and are acting quite willfully to attend to their own interests.
In short, we have a coalition not of the willing but of the disabled, the unwilling, and the opposed. And each has a clear agenda. The tragedy for Syria is that it's just not a common agenda. And here's why.