Civilian casualties will likely go up:
And this is only one scenario, under the Law of Unintended Consequences. What would happen to our reputation in the area is up for grabs. What would Israel do if we bomb Syria? would they jump in? what would happen then? what would Iran do? What would al Quaeda do? what would happen to Americans at home and abroad?
President Obama should defer to the international community on these issues, not to mention the American people (I hesitate to suggest that he consult with the craziness that is our Congress).