illegitimis non carborundum wrote: "Gassing innocent women and children violates accepted international rules of war. It is a war crime."  
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Killing civilians is a war crime too and we are just as guilty of violating the "accepted international rules of war" as whoever used gas in Syria.   You are aware of the many dead that we killed with our bombs, you know that "collateral damage" in Iraq where we bombed/bomb women and children to bits on a regular basis?  There's a reason why the United States is not a member of the International Criminal Court and it's not good one.  
https://en.wikipedia.org/wiki/United_States_and_the_International_Criminal_Court