Some well-meaning progressives have been made to believe the rebellion in Syria started out good but became co-opted by Islamists only later. But that is just more deceptive propaganda that was peddled after the big lie (moderate rebels) was debunked over and over again.
Basically, after it was proven the rebels were not really "moderates", but insanely regressive terrorists, neocons and neoliberals changed the goalposts and said something to the effect of, "Yea, but the original rebellion was liberal and democratic and the evil Assad just messed it up." In reality, the rebels were always regressive, terrorist lunatics being bankrolled by foreign actors like the US, the UK, Saudi Arabia, and Turkey. They were never moderate.