Governments should have no more power than individuals. Morally proper governments are created by groups of sovereign individuals who voluntarily band together to protect themselves from those who would use force or fraud to take their lives, liberty or property. What is our (your) moral responsibility to help those who are being slaughtered by their own government? Half way around the world? In Syria?
Individuals can decide for themselves whether or not they want to assist financially or personally in the fight against any given oppressors. But governments, which are representatives of all of the people, should not enter into war or other foreign conflicts based on the judgement of a simple majority of the people, or upon the directive of a single elected official – namely, the President of the United States.
That is why our Constitution grants the power to declare war only to the Congress. Both houses of Congress, the House and the Senate, must approve any declaration of war. If there is truly an imminent threat to the people of the U.S., then approval by Congress should be fairly easy. When the threat to the citizens of the U.S. is not clear, then it should be difficult for the U.S., and the President, to declare war.
It is a terrible thing that is happening in Syria, but the United States is not threatened in any way by the their civil war. Even if we assume that the Assad regime initiated the chemical weapons strike against its own people, that is not enough reason for the U.S., unilaterally, to become involved in the conflict. If the U.N. follows agreed upon processes and decides that military intervention is appropriate, then the U.S. should be part of an international force to stop the use of chemical weapons.