I can certainly see your point. And yet, Syria now presents a major difference with, say, Iraq in 2002: the country is *already* at war. Entire cities nearly razed, thousands of victims, fighters and civilians alike, large-scale gas attacks, war crimes on both sides... Western strikes cannot make Syria cannot descend into chaos, because it's already there.
So, while I doubt that an attack would make things any better, I can hardly see how it could make them worse. Iraq was by no means a nice place to live under Saddam, but most people got by somehow. That is less and less the case in Syria anyway.