He's not a fool. We can punish Assad for using chem weapons ... assuming he did so. But either the shiaa or sunnis will win in Syria. And, even then, it's only a battle in the religious intolerance wars. Carter's right that the only "solution" is finding a way for the sunnis and shiaa to coexist. Bushii failed in Iraq. Obama is failing as well. I'm not sure the US can be the catalysit for peace.
There is no resolution between Sunni's and Shia because they don't want one. We're talking religious hate, there's no reasoning with that. Another great reason for the "not our problem" approach.