If al Assad and the leadership are removed, his followers -- a substantial minority -- will continue to resist, much as the Sunnis did in Iraq. They have gained much from the al Assad regime and, in their minds, they face disaster if the Sunnis win. The Sunnis have much brutality to repay. On the Sunni side, there may be a secular liberal democratic group, but if so it is poorly organized and control is in the hands of Islamists and other more radical Islamists, some with ties to al Qaeda. The civil war will continue unless the United States intervenes on behalf of the Islamists, uses its power to crush the Alawites and hands power to the Islamists. A variant of this happened in Iraq when the United States sought to crush the Sunnis but did not want to give power to the Shia. The result was that everyone turned on the Americans.
That will be the result of a neutral intervention or an intervention designed to create a constitutional democracy. Those who intervene will find themselves trapped between the reality of Syria and the assorted fantasies that occasionally drive U.S. and European foreign policy. No great harm will come in any strategic sense. The United States and Europe have huge populations and enormous wealth. They can, in that sense, afford such interventions. But the United States cannot afford continual defeats as a result of intervening in countries of marginal national interest, where it sets for itself irrational political goals for the war. In some sense, power has to do with perception, and not learning from mistakes undermines power.
Many things are beyond the military power of the United States. Creating constitutional democracies by invasion is one of those things. There will be those who say intervention is to stop the bloodshed, not to impose Western values. Others will say intervention that does not impose Western values is pointless. Both miss the point. You cannot stop a civil war by adding another faction to the war unless that faction brings overwhelming power to bear. The United States has a great deal of power, but not overwhelming power, and overwhelming power's use means overwhelming casualties. And you cannot transform the political culture of a country from the outside unless you are prepared to devastate it as was done with Germany and Japan.
The United States, with its European allies, does not have the force needed to end Syria's bloodshed. If it tried, it would merely be held responsible for the bloodshed without achieving any strategic goal. There are places to go to war, but they should be few and of supreme importance. The bloodshed in Syria is not more important to the United States than it is to the Syrians.
