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Well, as the man himself said, no matter what they say, no matter even what evidence they produce, you will always get some people who will refuse to believe - that's human nature.
In another topic you assert that the civil war is all but over and that the US is concerned now that Assad will win after all, thus bolstering Iran.
I don't know enough about the exact state of the rebels to know whether the rebels really are about to collape: it doesn't sound like it I must say but i don;t really know.
However, if Assad really were to "win" it would simply be back to the status quo as before which if you recall everyone seemed wuite happy with including the US. Also, if the idea really is regime change as you seem to think, and the war is all but won by Assad than we are talking some sort of major war the like of which has always been ruled out beofre and which I am absolutely certain, whatever else may happen, is no way on the cards.
I'm sure though that Iran does loom large in America's thoughts. They seem concerned that if Assad is seen to get away with using these weapons (he's used them at least 15 times this year it seems) then Iran will think it can get away with continuing to build their bomb with impunity.
The Americans didn't start this war (unless you believe that as well!)