Did you know that Syria hasn't signed any convention that prohibits the use of chemical weapons against its own people?
http://www.aljazeera.com/indepth/opi...244943321.html
The US used chemical weapons in Vietnam and they sold it to Saddam Hussein to fight Iran. They showed him where to drop it in Iran, to gain maximum effect. Hussein gased the Kurds in northern Iraq too.
http://www.foreignpolicy.com/article...he_gassed_iran
This, and the huge advantage of an gas attack for the aggressors and rebels in Syria should make us think twice.