I'm not really aware of what's going on in Syria, and not really sure who's worse - Assad or the rebels, but it seems clear that Iran & Russia, which were main backers of Assad regime, appears extremely weak. That's understandable for Iran which may want to avoid to overextend itself following the recent events, but it's hard to comprehend why Russia was unable to do anything at all. In any case, it seems like there…
In the previous active phase of war in Syria Hezbollah was one of the main Assad supporters that provided manpower. They are extremely weakened right now, so in a way rebels can thank Israel for indirect help.
From the cold-blooded point of view, it makes sense, somehow "It's fine" when the US bombs are being dropped by the IDF, and screwing Russia helps Ukraine and Europe too. But probably that's a myopic point of view, a lot of the world has burning hatred against Israel and the USA now.