I never denied that Assad undertook chemical attacks against civilians
However, you refuse to acknowledge Western propaganda efforts to pull the US into a war in Syria - at your own peril too.
Moreover, America is funding/supporting Al Qaeda in Syria
In Syria, militias armed by the Pentagon fight those armed by the CIA
Arming Syrian rebels: Where the US went wrong - BBC News
Stop being a lackey
You've speculated the chemical attack could've come from rebels multiple times throughout this thread.
This is more loose yarns being tied together to fit into a grand narrative. The U.S. tried to arm vetted rebels and the program was largely a failure. They were overpowered and never gained much credibility. Post-2013, the U.S.'s policy was by and large focused on fighting ISIS while dividing spheres of influence with Russia and avoiding direct confrontation with the regime. You cannot seriously believe the U.S.'s main policy intent was regime change under Obama? The CIA programs budget and support pales in comparison to hundreds of billions spent on ISIS airstrikes, arming YPG, and putting special forces on the ground. The U.S. definitively did not want to get pulled into a war with Assad under Obama. Whether this changes now who knows. I suspect that it wont and the big picture is fixed.
The sad thing is you cant make a principled argument for non-intervention that acknowledges: the Assad Regimes nature, that international intervention is already happening and focused on ISIS as well as propping up Syrian regime, and that the U.S. has largely been trying its best to avoid confrontation with the Russia or the regime.