https://www.lrb.co.uk/v36/n08/seymour-m-hersh/the-red-line-a...
https://www.lrb.co.uk/v38/n01/seymour-m-hersh/military-to-mi...
Stratfor, something like a private intelligence organization - well beyond a think tank, also has written a vast amount on Syria to the point that I think just googling for 'strator syria' would be more productive than me listing a slew of articles. In general I find news that's from first party analysts tends to be vastly more informative than the filtered drivel that you end up getting from most US news sites.
As an aside, I am not suggesting that that the above directly support OP's hypothesis. What it does support is the fact that what's stated in most US mainstream outlets is a childlike misrepresentation of the war over there framing it as the 'good guys' (which is naturally us) are trying to take out a pure evil 'bad guy.' I'm not sure if that's propaganda or just something that gets clicks. In either case, it's false. The interactions are complex, motivations rarely benevolent, and the whole thing an entire mess in general.
Ultimately the reason I stopped reading about Syria is because I think it's futile to try to 'truly' understand what's happening. We'll only be able to begin to actually dig into the truth 50 or so years from now when the documentation around the war is declassified.