It’s amazing how often I am presented with this ridiculous non-argument. US interventionism is ALWAYS disastrous, ALWAYS based around the geopolitical agendas of plutocrats and intelligence agencies, NEVER about humanitarianism, and NEVER accomplishes what its proponents say it will accomplish. Saying these undeniable facts doesn’t mean I think Putin and Assad are “angels”.
I will say, though, that the US-centralized empire has had regime change designs on Syria for many years and has an extensive and well-documented history of using lies, propaganda and false flags to manufacture public support for war agendas. So it’s naive to feel certain of any claims about chemical weapons and arbitrary civilian slaughter.
Your calling them “Rebels” is also misleading. Those are terrorists. Known terrorist factions funded and armed by the US and its allies.