There is enough history of America's involvement in the Mideast to ensure any action in any country in that region will cost American lives and billions of dollars. The result has been, and will be, that when America leaves, one religious or radical faction replaces the one we supported. One cannot name a country that we support with money or military presence that has in turn supported America.
Case in point is Egypt. Got rid of one strong man and supported the takeover of the Islamic Brotherhood, which is a sworn enemy of America. Now they have been replaced by the military, and the suits in Washington have no idea where it will go from this point. Now it is Syria, and regardless of winners or losers, America will be sending dollars to the winner.
Enough American blood has been shed. Time to worry about the many problems faced here on home soil.