"Assad falling is good, because Assad is a dictator. The left should be against dictators, yet many on Twitter proclaimed that supporting the dictator was Good Leftism, Actually.
Syrians and Ukrainians should be supported by the left. Just because Assad and Russia are enemies of the capitalist West doesn't mean that they should get a free pass from the left to oppress Syrians and Ukrainians.
Palestinians should be supported by Americans. Just because Israel is a nominal ally of the US doesn't mean that they should get a free pass from Americans to oppress Palestinians.
The tankie communities are definitely seeing the fall of Assad as a very bad thing. I was surprised at first, but then not surprised that they'd be supportive of dictator that aligns with Russia.