Maybe so, but our stated purpose in Syria was to ‘fight the terrorists’, which was EXACTLY what Assad was trying to do, so it looks as though we didn’t help him much. You know what they say: “With allies like that, who needs enemies.”
Just to be clear Russia was Syria (Assad’s) ally, not the U.S. Yes, at one time, the U.S. was kind of Assad’s ally to. But Syria was Russia’s client state, and they were always promising them more weapons, and protecting their integrity.
Give me a break. Assad was only about protecting his own interests. He worked for Iran, so he had no problem with their terrorists, and no problem with Hamas, and Hezbollah. So, he only was against terrorists that threatened his personal power.
ISIS was an enemy of Iran, and eventually them/their successors were against Syria, so yes, sometimes he was against terrorists.