Those who oppose action in Syria are in effect saying that there should be no response illegal use of weapons of mass destruction. Funny, a few years back we mounted huge war on the suspicion that there might be stockpile of WMDs in Iraq, whereas now we know that the weapons are there because they’ve been used. Anyone who supported the war in Iraq ought to support some kind of response in this situation. (Of course we can then ask “What kind of response?” but that’s another question for another time.) Now if the US makes no response to this use of WMDs, what message gets sent to Iran?