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The Syrian war is complicated, but that does not mean that for every single incident you can simply throw up your hands and go 'bah, phew, there's a lot more to this than meets the eye. Just to repeat yet again, that's simply trying to obfuscate an unpalatable truth - for whatever reason you might want to do that.
Let's look again at the Russian fairy story: for one thing their timing does not match the first pictures of the incident. For another, aerial footage of the scene based on geolocation of the incident shows nothing like an impact crater for a munitions dump. Then there's the fact that the chemical weapons used in Syria and Iraq are binary agents, which means that they have to be 'primed' shortly before use and would, as I said earlier, have been destroyed harmlessly in any explosion - albeit it with rather a big bang and fire, of which there's in any case no evidence.
Also, the Russians claimed that these alleged weapons were for use by rebels in Iraq, despite the fact that to transport them there they'd need to cross through territory held by other government and IS. And in any case, for that purpose? The only possible target for them would be IS in Iraq, whom the rebels aren't even fighting.
Someone above questioned why Assad would endanger his 'lottery win' with this sort of PR 'car wreck' , but as a matter of fact Assad has lost a few battles recently. There was a surprise rebel offensive last week, and at times even Aleppo has been cut off. So plenty of reasons why he might go for a revenge terror attack. After all he's got away with everything else so far.