It sure would not take a lot of VX gas in the NY subway system
to cause a panic that would paralyze the city.
Syrians have had plenty of their own WMDs for decades, including during a variety of Democratic administrations, and they've never been used.
People have begun to assign some sort of mystical unique significance to the Iraqi chemical program. The Syrian program was just as advanced and they have their own production facilities cranking out quite a bit of a variety of agents including nerve gases every year.
If the reports are true this isn't the case of a nation that never had WMDs before suddenly getting WMDs.