“Your narrative simply doesn’t mesh with the actual facts of the US involvement in Syria since 2011.”
Obama authorized aid in 2012. Given that Syria had been complicit in funneling Sunni Arab jihadists to Iraq to kill GI’s, he was fully-justified in doing so to get some payback. For Assad, this was blowback. The Sunni Arab jihadists he had sponsored were now attacking his government. Assad played with fire and got burnt.