If the Syrians use Chemical WMD on Turkey, it will be WWIII going hot and full bore. At that point, international war crimes will be mute. Thousands will be dieing from Chemical and Biological attacks in the region.
With them out of the way we can move forward with our agenda in the middle east.
And that current agenda appear to be getting Chemical and Biological WMD's into the hands of Islamic Sunni terrorist organizations. You do not realize something. Russia, China and Iran now HAVE to stop the US. Obama's stupidity, ineptitude and cronyism has given them no choice.
The Syrian army will use or attempt to use chemical weapons on the Syian rebels, thus causing international outrage. The Iranians, Russians, and Chinese will have to withdraw their support for Assad. This will allow th installion of a democratically elected dictator.
Overthrowing unfriendly/unstable governments and installing soft dictators is our current policy. See, Tunisia, Egypt, And Libya.
There are numerous articles coming out now with concern about Syria using chemical weapons. Turkey is requesting NATO missle defense systems in fear of chemical attack. These articles are being floated in advance of the event IMHO.