Let me break it down for you as my last act of the evening. The FSA are the main rebel group. Since western intervention hasn't been forthcoming they have lent increasingly on the most effective groups fighting Assad in Syria, who are the extremist factions, notably in this case the 6000 strong Al Nusra Front, although the 15 extremist groups in Syria have formed the Syrian liberation front - these are the lot the unwashed uninformed thinks are the FSA.
Our complete failure to do anything in the face of them being gassed - im presuming we have seriously undermined the US' actions and as that means were relying on the UN and the russian veto on them doing anything = a big fat nothing. Should the FSA triumph they will have access to the stockpiles of chemical weaponry that Assad has. Since the extremists will likely really be in charge, thats military grade chemicals starting to wheedle their way out of syria and probably into afghanistan. Deterring assad from using the weps would have promoted the secular wing of the FSA as having had serious backing and possibly toppled Damascus. After that the FSA have said multiple times they didnt want to swap one tyranny for the tyranny of extremism. Now they have to dance with that particular devil because chums, gas gas gas.
Ironically, if Assad now uses the WMDs on the opposition he can win the war and guarantee the stockpiles dont fall into the hands of extremists linked to AQ. We can turn a blind eye to the mountain of dead, everyone wins. Except the mountain of dead of course.