Because there were no chemical weapons and obama and kerry are fabricating reasons to out Assad and cover up whatever happened in Beghazi.
Actually the trail from Benghazi to Syria is what they are covering up IMO. Kerry is too stupid to know he is in the job to be the bag holder when this all blows up, literally. Notice we dont hear much from his excellency who will just say he was informed by Kerry and the CIA and finally went with their assessments.